I think that Gordon is more of a glue guy. He'll do the dirty work, the hustle plays, defend, play smart. But he looks seriously bad offensively.
Bad shooter, can't create his own shot, basically has to rely on others feeding him easy buckets, or getting offense from movement based plays like backdoor cuts, oops, etc.
So in my mind, he's like a poor man's Shane Battier who can't shoot. At least with Battier, you got a guy who could also space the floor and threaten the defense on the perimeter. Knocking down some wide open shots.
With Vonleh, I'm worried that he's not really an elite defender or athlete. But you can't teach his length and it looks like he has the basic offensive fundamentals down where he knows how to exploit his size and length in the post game. I'm just not convinced that either of these players would deserve to be in the top 5. But in the latter portions of the lottery I could see it.
Vonleh's upside might be a poor man's Rasheed Wallace. Because he has some range to his shooting as a big man. I worry about his strength and defensive game though.