I'd rather keep Glen Davis, myself. From what I've read and seen, he appears to be in the best shape of his career so far, even with the injury.
His rebounding has been a challenge, but IMO that will improve with him being in better shape.
I'd say give Glen a shot at showing what he can do this season, IMO. The guy can certainly score. And believe it or not, he is the most experienced Celtics Big bench player.
Good Discussion, though. Warrick has always intrigued me.