Shooting 3's off the dribble is one of the big things that separate the top-tier players from the rest. If White masters that, he really will be something special - but it's a lot to ask. I love his patience once he gets into the paint. I think he would do well to develop a floater. Force defenders to honor that, and it will help him get all the way to the rim more often.
Murray needs 10 lbs. of muscle. He's got the shoulders to carry it. He obviously needs to improve his shooting, but really getting after a weight program is something that would help him make the most out of what he already has.
Poeltl also needs some bulk. He's not going to be a bruiser like Baynes, but he's going to have to play against those guys. The low post is a brutal place. He was a better finisher at the start of the season, but guys started getting more physical and knocking him off his shot. He sets good screens, and he's a good roll man - both things the Spurs have been missing. But he needs more bulk and strength for his time in the middle.
For DeRozan to improve, he's going to have to buy into ball movement. For his career, he's shot .365 on corner 3's. I think he could do it from straight away, if he would be willing to catch and shoot. It's not his game, though, and I have doubts that it ever could be. The big thing is for him to understand that the ball needs to move, and that his doesn't have to be the last pass before a shot.
Bertans would be better if Pop would let him play an enforcer role. He's a tough, scrappy sonofa and always was. Pop won't allow it, so that's sort of pointless to think about.
None of us have really seen enough of Walker. Metu is just a marginal NBA player. Forbes will be fine anyplace that defense is not played, and he'll improve this team the most if the Spurs find a place like that to trade him.