I agree, there might be nothing going on in the locker room at all, maybe that is why no one has spoken about it. The players aren't stupid, they know what the front office plan is.
When Davis signed they were a playoff team, they get a beatdown by the Ravens and were in the middle of a beatdown by the Chargers. Maybe he just didn't have the love for the game, he could have felt his body was failing him, maybe he realised there was going to be no fairy tale like the previous year or didn't want to be in Buffalo at all, just there for a last payday.
All we have to go by was his press release but if we don't have the facts and there is silence on the matter then we make up the facts (they lost the locker room) and feel the keyboard wrath if you disagree.