CoC is a jinx himself.
I agree, I think O'Hearn's emergence might have stirred something in him. I hope so, anyway.
There was that anecdote from ST all those years ago, Buck asked him why he didn't walk more, or why he wasn't more selective with swinging at pitches and Mountcastle laughed or something. I don't remember the details but the impression was that he did know better and he did know it was stupid to swing at some of the stuff he was swinging at but he wasn't up there to walk. He was up there to hack.
That said, he does seem like a reasonably intelligent guy. I have a hard time marrying the ideas that he knows better than to swing at low and outside sliders but he chooses to ignore it...and that it took O'Hearn raking while he was on rehab to have the realization that he needs to get his act together, use the whole field and be a more selective hitter.
I want to believe that narrative but it's hard.
But maybe he is that stubborn, maybe being awful for the 2nd half last year wasn't enough for him to want to change. Hard to say.