I wouldn't want Vassell to put on too much muscle, though. Maybe 10-20 pounds at most, would be healthy as he grows into his body, definitely not 30+ though. Good perimeter defenders in this modern NBA tend to have that long, lanky, nimble body type, and bulking up over the count can be counter-productive, losing speed and agility with mass that won't be of much use in other areas. I actually really like the combination at SF between Keldon and Vassell, they have opposite games and body types that compliment each others'. I wonder if the Spurs could get away with lineups with the both of them, one at the 4, with Jakob as the traditional 5.
A lineup of White - Dejounte - Vassell - Keldon - Poeltl would be really hard to score on. Let's get back to defense oriented play...