It's a bit discomfiting that Grant Williams was a poor culture fit on a team that is currently 40 games over .500, and a poor culture fit on a team that is currently 11 games over .500, but is a good culture fit on a team that is currently 35 games under .500. Actually, that in itself might be disqualifying.
Tatum defended Williams though, and I tend to trust his opinion on his own former teammates over the Celtics announcer's second hand locker room gossip. Also Dallas has Jason Kidd running the show who has already put a player in the hospital when he was the Bucks head coach and I'm not even going to get into all of the recent culture issues in that Dallas organization. Anyone who wants to know and doesn't already can Google "Dallas Mavs scandal" and read about it.