12. Grant Williams
The Dallas Mavericks pulled off a big sign and trade this summer in a three-team deal with the Boston Celtics and San Antonio Spurs.
Dallas sent the Spurs Reggie Bullock and a first-round pick swap while receiving two second-round picks and Grant Williams. The Mavs needed a big-bodied forward who could guard multiple positions and stretch the floor, and that's what they got in Williams.
Although he has been struggling over the last few weeks, Williams averages 9.6 points, 3.9 rebounds, 1.7 assists, and 0.5 blocks per game while shooting 40 percent from downtown. He is still shooting 39.5 percent from downtown while going through this massive slump, and his improvement could be crucial for Dallas' success.
With Maxi Kleber being out for extended time with his toe injury, Williams has had to carry tons of slack in the frontcourt. He is playing a career-high 29.4 minutes per game and is one of Dallas' only players with enough size and strength to battle in the post.
I don't see Dallas moving Williams just because of his extreme importance to what they do defensively and due to the fact they just signed him. Things could change if he doesn't begin to shoot better, but Williams means too much to this team on and off the floor for them to move on this quickly.