Versatility to me means a player who is fundamentally sound in all aspects of the game, offensively and defensively (Sorry Irk

) it shouldn't matter what his height is or what position he plays, if he can effectively be successful at all aspects of the game, he's versatile to me.
I'm surprised no one's mentioned Andrei Kirilenko yet, arguably the best defender in the NBA. He can shoot (45% FG, 34% 3PT FG), he can rebound (8 RPG), he can create, he can pass (3 APG), he can block shots (3 BPG), he can steal the ball (2 SPG) and he can score when needed (17 PPG). That to me is versatility, and in terms of that no one comes close to AK-47.