So Sullinger isn't as Developed or Experienced as Kanter, that's all that says.
Kanter is younger, bigger and arguably more athletic. As has been pointed out, if Kanter had played for Kentucky this year, he'd likely be the Top pick in the this Years draft.
ADD I posted this in the Draft Sticky, but:
http://www.youtube.com/watch?v=6YzbhAQGPqk
And this is hardly a case of Men Against Boys. Just because Kanter has been playing Professionally, doesn't take away from the fact that he was able to seperate himself from the literal 'Men', even when he was 17.
Just because Jennings played in Europe Professionally before the NBA doesn't mean he's all of a sudden got more ability, or an added advantage.