I think you might be putting 2 & 2 together & getting 5 Surely if there was ill feeling/an incident between Brendan & the Manager he would retire from County football, at this stage he owes Armagh nothing & he's not compelled to be there.
I have no inside knowledge so don't know what the situation is, but I find it hard to believe that Brendan would continue to commit to the squad if he believed his county playing days were at an end.
We'll know after tonight. If he doesn't feature I'd say he'll not be hanging around. Can't say I have inside knowledge but have heard he's fully fit.