Some certainly do, but I think there are guys that do very well at Basketball, that would struggle in the AFL.
Somebody like Jawai would certainly be a massive presence, and would be hard to shift from the goal square, but he wouldn't have the tank for modern AFL.
I've previously read that Knight wants to play for West Perth when he retires from NBL. He'd make a great around the ground ruckman, or forward, but his lack of speed would preclude him from AFL.
Worthington actually tried out for the Eagles, and decided it wasn't for him.
Smaller, quick, agile, skillful guys like Prather would make good midfielders and small forwards, if they could master the ball skills, AND the increased level of fitness.