How come everyone knew Brian Hoover was a turn over machine but o'Brien?
That's almost the right question. It should be: "Why did O'Brien think he would get better results from Hoyer than Cleveland did?"
My answer is that O'Brien developed a professional respect for Hoyer in New England that led to a bias in his ability to be a starter. There was probably a personal relationship there too. That bias starts leading to rationalizations like, "He was just in the wrong system in Cleveland. He didn't have the right coaches, not enough support, no chemistry. "
This happens often in any professional organization. An up-and-comer talks the talk with his superiors, impresses, gets favoritism, and moves up. Then he turns out to be a terrible manager. But then the other guy -- the cocky asshole who pisses everyone off -- he outperforms the favored guy because he knows how to function under pressure and be assertive. It's hard for the superior to give up on the favored guy, because he was envisioned to be the future, and giving up on him means killing his career path.
Well I've seen that scenario plenty of times in my work life, and we just saw it today in a football game.
And if there's anyone who's shocked about this, it's O'Brien. To his credit, Hoyer didn't perform anything like this in camp or preseason. We all saw those games too. But it wasn't until today that the real Hoyer showed up like the bride who reveals her insanity the day after the wedding. Previously, all her stories about her ex-husbands made her out to be the victim, until the day you sympathized with the ex's.
And also to O'Brien's credit, he yanked Hoyer's leash in-game to see how Mallett performed under pressure. Well, the cocky asshole functioned, and he's going to be the one to earn the promotion, just as it happens so often in the real world.