When the GM publicly states that, "he needed to change the culture of the clubhouse," there's definitely a problem. It's no secret Crawford & Gonzalez didn't want to be here, and Beckett was livid after he was ripped publicly after he decided to play 18 holes with Buchholz the day after he missed a start for "soreness." Beckett made his next start and threw batting practice for about 3 innings before Valentine finally yanked him. It was his "FU" to management.
No one can prove anything on this message board, but everything I've heard & read makes me think that it was much worse than most fans realize. My guess is that it will be a pretty big chapter in someone's book at some point. For now, we'all just have to disagree.