For Vonleh, I think it comes down to his in-game quickness. If he can play fast and if he can slash to the rim he becomes a much more valuable player. He's deceptively quick, I think. But I'd really like to see Gordon, Randle and Vonleh go at each other in a workout.
You look at how the Spurs dismantled OKC, and they did it by having 4 or 5 shooters on the floor. They had phenomenal spacing that OKC couldn't cover, and it resulted in guys like Boris Diaw and Tiago Splitter getting uncontested layups. A line-up with Burke, Kanter and Vonleh spreading the floor and Burks and Hayward attacking the seams would be very hard to stop.
Teams now are playing 3-guard line-ups and other small-ball lineups because they want more guys on the floor who can space the floor AND beat their defender off the dribble. A player who can do both of those things is valuable.