Yes He Can ...
In fact, I remember (but I wouldn't count on it, my memory ain't all that great) one time during an interview with B-Jax the topic was dunking and there was a contest with Darrick Martin, Bobby Jackson and Mike Bibby as to who would be the first to get a dunk in a game. I believe Bobby Jackson won the contest but Bibby remarked he doesn't like to dunk cause it really drains him of energy and endurance that he'd rather use for playing rather than show.
I don't blame him ... some of those moves he makes are just AMAZING. The way he twists and curls himself-up and tosses it up there and the ball somehow manages to go in are pretty spectacular.