griffin, b jennings, mcgee, and ibaka..
call me crazy but im going w/ jennings. while he might not have as many highlights as griffin posterizing dudes, he can still hop. hes not much of an in-game dunker b/c of his size, but in a contest, his creativity and bounce should be enough to pull off the upset. griffin is obviously the favorite, but as long as he doesnt dunk himself (which is a possibility), jennings has a shot.
but ibaka though?? sure he can throwdown, but for a dunk contest? c'mon man..