They are giving him a 76% chance of having a role in the NBA (All-Star, Starter, Role Player).
I think I've been one of the more "pro-Kostas" folks here the last few months...and 76% seems waaaaaaaaay too high. I would have put it at 30% - 40% tops. Still worth a late round pick.
I'm not even sure 1st round picks have a 76% success rate...