I'd probably trade Davis for a bag of balls.
Agree that he doesn't seem mentally suited for his natural backup/energy role, and consequently is a perpetual headache. As Doc said, if BBD doesn't know his role by now...and I'll add, if he can't or won't accept it...
But I don't think his value is as high around the league, either in a contract or a trade, than he thinks/wants it to be. I don't think we'd get much for him without throwing in a pick to sweeten the deal. ESPECIALLY for a legit 7-foot center.