He was pretty much pushed out the door because Horan should have know full well he had handle Conoreen better than he did or there would be problems.
He did the same thing to Feeney and it remains a mystery why Feeney even bothering training for the best part of a year this season when he knew he was on Horan's blacklist. The natural response is to lose interest if you're not getting a fair shake, and Conoreen wasn't.
Conoreen was no more wrong going than Feeney was wrong staying. The only constant is Horan, so let's not absolve him because he (in Conoreen's words) lost ye a few more AI finals.