Explain non boxer outpunching Holyfield and Froch

Guys if Pacquaio is claimed as having devastating power n Khan some are not sure about. How come Khan is dominating him in this sparring session.
http://www.youtube.com/watch?v=2g-U4LM46ng&feature=related
Pacquaio is a proud competitor and Freddie Roache's gym rules (he has stated publicly) is that you go at it, but if you stun someone or wind someone you back off. Khan dominates him with speed and power. Even when he lands just on the gloves there's enough whizz on it to knock Pacquaio back. I am certain Khan has more force on a straight left jab than John Duddy. If you're talking about fast boxers having no power than they are pulling up that shot in the last few milliseconds (bad hands, defensive boxer, fear) or have a rake thin arm (it counts) and poor weight transfer with the hips in action, hence a tiny mass. It's weight and speed nothing else. Technique can only change the direction of that force, n prevent backward movement at moment of impact.
If someone holds up a pad in front of you n you hit straight through it. That's good technique. Bad technique you might be crooked and glance off it. Hence less force. So leaving aside the directional aid of technique, speed is the main (greater than 50% contributor to force in a punch).
To work it out it's 1/2 the mass in the punch multipled by the velocity squared.
John Duddy is approx 20% heavier than Khan. Guess what Khan only has to punch 10% faster than John Duddy to punch with the same force (1.1 squared = 1.21). 14% faster if we say Duddys heavier arm n shoulder gives him 30% more weight transfer.
Khan might be the fastest in his lighter faster division, Duddy is below average speed in his heavier slower division. I would think Khan is easily 10% - 14% faster than John Duddy.
(We'll leave aside for the moment technique. Two professional boxers will have roughly similar abilities to transfer weight to a punch. So a 20% heavier guy should transfer approx 30% more weight to the punch given his significantly heavier arm, shoulder n fist. Torso will be about 20% heavier or less. Bigger difference just in the arm n fist)

Colly 10 I make my argument based on facts of science. Then yourself and others dismiss my arguments based on this notion that "Science don't work in the real world". It's modern sports scientists who have advised boxers to call a halt to the daily ten mile run routines of the past. Dismissing Science is ridiculous. Phrases such as "natural power", "natural strength", "heavy hands", their all just different variations of the same Scientific laws.
Using Manny Pacquaios arguments over a 2lb catchweight for a bout proves what???? It would more clearly prove Mannys heavier opponents are coming down in weight, so Manny wants to weight drain them. If they're coming down in weight 2lbs more than they'd like it should drain their energy levels a little bit more. Then the advantage to Manny is in stamina in the later rounds. If they could get it, they'd bring an opponent down 3lbs, 4lbs. Manny is smaller so he is full of energy at those lighter weights, his opponents are not. You're the boxer, that should be screamingly obvious for that situation.

If you go back to my longer post with the Science, you see that I have taken technique out of the argument. Read it clearly, two professional boxers should have similar abilities to put their maximal weight behind a punch using good boxing technique. Once they have launched their weight well then we are down to speed. I even allowed for a heavier boxers heavier hands, forearms n shoulders. So yes a 20% heavier boxer may get 30% more weight into the shot or more.
Your argument concerning Bernard Dunne and Bernard Hopkins is a ridiculous retort to the whole debate. Dunne is a super Bantamweight n hopkins is a Light Heavyweight. So your problem straight away would be the size of Dunnes Hands compared to Hopkins shovels. Anyone who has used a smaller/bigger sledge hammer sees the effect in momentum of having a heavier weight at the end of the hit. N anyone who has shook hands with Mick Dowling (I did once) or Bernard Dunne can see how small a bantamweights hands are compared to a typical persons.

To stir it up again A weight (boxers punch weight) launched at a target will produce a force directly proportional to the square of the speed.

You are right though in some of the statements you are making. Your power would not trouble a heavyweight. But then look at the jawbone and neck of anyone who stands 6'4" and weighs 16 stone. Also putting all your effort into a right hook landing on the sweet spot (all your effort) you could be well capable of knocking out a heavyweight, I'd be confident you could have knocked out Michael Moorer n he was a heavyweight (glass jawed though). Just in a ring situation someone 5'10 will struggle to get a clean shot on someone 6'4".
One of the main reasons bigger boxers aren't troubled by smaller boxers is reach and neck/jaw. Watch Klitschko round one against Chagaev and see how actually pathetically unpowerful a large mans left jab can be if he is slow. Honestly Klitschko had nothing on his left jab and he's 18 stone. But he could use his reach to push off Chagaev n time up the right when he wanted.
It only takes a small jab to put someone off as they advance in. It won't be damaging but it unbalances n blinds.
N all large slow mens best punch is a straight right down the middle with all their weight behind it to make up for their lack of speed. Lennox Lewis was the same. His main shot was his straight right. Very rarely take you out with hooks or combos snapped at pace.
Carl Froch is the same, we've seen countless of his fights, try n point to a single decent left jab that stunned anyone. N yer talking about hundreds of left jabs thrown there. Again that particular fighter has to rely on stamina as he has average speed.

Finally to wrap up the main reason fighters end up finished offensive wise (defense speed gone too I know), is that they age n their speed goes, n they can no longer offer much of an offensive threat when they do land. Older heavyweights are much heavier than in their prime yet their power is seriously dimished, please explain that logically? Same technique, same boxer, more weight, much less speed, and therefore much less power. Do we agree on that surely?
What could be a better demonstration of speed being the major factor in power than the same heavier boxer having less power due to the effects of age reducing his handspeed?

I'll wager too that Roy Jones in his prime could hit all of the following shots harder from a standing position than Klitcschko left hook, right hook, n left jab. Now Klitcschko would be much stronger with a straight right n right uppercut. The two punches where his massive weight advantage takes over. Could 18 stone Klitchsko ever hit as powerful a right hook as in the link below, from a standing position with only a half step in like Jones does? Straight question standing position, half step in proper right hook around the side. Not a shot now where he was able to dive full into it n take full step.
No vague explanations involving head clean off, natural power, mincemeat of Jones etc. See Jones right hook below, a shot solely demonstrating speeds massive contribution to power, seeing as it's difficult to put much weight on this shot (see how he throws it), Jones demonstrates knockout power with speed alone n a small amount o weight.
http://www.youtube.com/watch?v=AWQlbOkKCD0

I'v never had a boxing match but I know that you can't get much weight behind that shot due to the body position, so it was purely down to speed. It is possible for a super middleweight to punch like a heavy weight on certain punches.

Now full bodied into it with a full step a heavyweight can throw a harder right hook. But as demonstrated above it's not impossible to outdo their power being the much lighter man for certain punches.

Cowzerp I wouldn't disagree on any o them.
Calzaghe - fast hands, but not blinding, n his technique was poor so not much power.
He fought often in a skirmishy style nearly throwing left n right together.
His power was average, he has a runners type build so slight upper body. He is 6' 1" so I wouldn't expect him to be muscular n powerful at 12 stone 7bs.
N with his upright stance he was never really pushing into the shots with his legs.
Nazeen - Really dove into shots using his legs n had good speed, n was a light weight. I agree he was powerful.
Mayweather - decent power. Hands are probably an issue at this stage. But I think he's one o the few boxers could have thrown that shot to knock out Hatton. The way he had his left hand ready, I think with him he has a really flexible hips n strong core, so he can lean in quickly to a punch and to defend when leaning away.

Calzaghe was more about wearing a man down. Even when he would have a guy in trouble he would stand near, with feet parallel and just whirl away left n right. Don't think he liked risking his hands with bigger shots.