If he stays in the draft, Shawne Williams may possibly become a star. A lot of potential, a lot of hype, it's just that he hasn't capitalized yet...he can be a diamond in the rough especially where we draft. Smooth athleticism, good shooting ability, effortless player, good skill set. And he's still very young to boot, and may replace Devean George in the long run.
Saer Sene is a high risk/high reward type. You never know what you are going to get from raw players who suddenly appear out of nowhere and explode for big games, garnering great hype in the process. Yes, he may be like Samuel Dalembert or even better, but everything on him is based on his potential due to his physical tools, such as height and wingspan. I'm not sure we need a player like that with Andrew Bynum here anyway.
I'm not so sure about Daniel Gibson or whether he's even entering the draft. I've lost some degree of hope in his game because he hasn't displayed much point guard ability and he can easily be a huge disappointment or bust, even moreso, if he is drafted in the first round (which he shouldn't). Still has potential, but currently the potential tb be a bust is higher than the potential to be a star IMO.
Darius Washington doesn't seem to have star potential, especially with his score-first ability and slightly above average athleticism, and I ultimately see him as a borderline starter-sparkplug in the long run who can put up points in a hurry, such as Mo Williams.
Leon Powe doesn't either, I mean it's hard to be a player like Elton Brand, and Powe is certainly not that advanced offensively and certainly doesn't have Brand's monster work ethic--height will be a detriment to him in the long run but I expect him to be a solid 7th-8th man for many years to come.
Guillermo Diaz may seem a bit intriguing especially in potential with his slashing/shooting/athletic combination, and he certainly can be on this list. He's actually a bit of a sleeper IMO and can be a Gilbert Arenas-snubbed type if many teams pass on him. I think he can really be good in the long run if he puts his mind to it.
Not too many people know him, but Marcus Vinicius, with his freakishly long arms and nice shooting stroke, may also be a diamond in the rough. He's from Brazil. Thabo Sefolosha has similar attributes and can also be a nice role player down the road.
Hassan Adams will be a role player, 85% sure of that. James White hasn't capitalized in college but he may undoubtedly be better suited for the up-tempo NBA game. He just needs to find a niche, but I question his mental toughness a bit and he needs to put it all together to be a star in the NBA, which I doubt. He has great potential though.