This is shocking to me.
I have to figure it's related to off-the-court stuff and his obvious motivation problems, because he brought a lot more that a min contract to the table.
He had serious issues defending right at the rim (oddly, because that's one thing he should excel at) and he never got his jumper working, and his FTs sucked, but still, he put up 6.7 Win Shares last season (that's worth like $20M), WS/48 of 0.148 (well above average of 0.100), VORP liked him fine at 2.3, his PER was 18.0...all of the "basic" advanced stats liked him or loved him. He's got great size and great mobility for a big man, he can handle a switch onto a perimeter guy better than most big men ... and there was literally no market.
I don't get it.