This is the first I've heard stuff like that. You would think if it were true someone, Underhill, Duncan, Triplett, Kat, etc. would have gotten that information and reported it. I mean, certainly MT would have told Underhill and the team would have leaked it to Duncan.
But, if it is true, he clearly needs to be traded. Like it or not DA is here for at least another year and you can't have that in the locker room with young players. Plus, there is no guarantee he won't do that to a new head coach in a year or two. Lattimore is a talented guy but he's getting older and no player is really worth that if it is true.