I should add that if I was drafting a team and had Barkley and Nowitzki in my first two picks, I'd probably make them my power forward and center, then pick a defensive minded center in the last round as my 6th man. In the hypothetical games against teams with powerful low post offensive players the 6th man center could get more run, but in most matchups you play small and try and kill the other team with shooting and speed. There aren't that many players from the past few decades whom Dirk couldn't at least put up a fight against.