I think Thompson's the type of guy where once he gets further acclimated to the league (the game still seems to move too fast for him at times, especially defensively) he'll cut down on the careless turnovers and crazy hacking fouls...and that will open up some more possibilities in terms of his confidence. He's already solid at scoring and rebounding, and those should look really develop for him.
I think the scoring in particular has some potential; he dunks the ball at a very good frequency (#24 in the league in dunks, and that's only in 26 mpg), finishes well around the basket (61%), and is willing to really develop his jumpshot (takes nearly 50% of his shots from there, but only hits 36% so far--but with more experience/confidence that should improve). I think there's some all-around scoring potential with him with his inside-outside game--the post moves are questionable, but the face up game can develop well.
It seems like Jason is a far better offensive rebounder right now than he is defensive, as after all he is a good albeit foul prone hustle player right now. I think the defensive rebounding can develop.
Defensively, he has mobility and lateral quickness but he seems a little lost out there at times, and doesn't seem to guard the three point shooters or guys who can stretch the defense well. Not to mention he's extremely foul prone. I really don't think he's ever going to a shotblocker in this league at all (maybe he'll average slightly above 1 in his prime, but any more than that--really doubtful) because he doesn't have the timing down, not to mention that he's not very athletic. I wish he could steal the ball somewhat or play solid positional defense to compensate, but it seems the best we can hope for is just the solid positional defense. This is actually the area where I have the most concern, despite the mobility.
I don't really think JT has superstar potential (more like super role player potential in combination with hustle ability), but that being said I'm not enamored with Griffin either, as he's just a more bouncy version of Carlos Boozer with all the same weaknesses--questionable defensive technique, undersized, etc. We need a pass first unselfish PG, and we shouldn't get any duplicates here.