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The Round Mound has almost certainly become one of the game's all-time great analysts, but he won't beat Duncan as the all-time greatest power forward.
Barkley was arguably the most tenacious 4 in league history, an explosive competitor whose offensive rebounding ranks among the elite. At only 6'6'', Chuck still played above the rim and used his center of gravity skillfully.
An 11-time All-Star and one-time MVP, Barkley never got a championship, but it wasn't for lack of individual effort.
He averaged double-digit rebounds in all but the first of his 16 seasons and carried his teams on his back with the best of them.
Like Malone, you could make a strong case that—by the numbers—Barkley tops Duncan.
Again, however, Duncan's skill, defensive prowess and leadership translated into four championships whereas Malone and Barkley's singular dominance did not.
If greatness is defined by statistics alone, Duncan may fall short. By any success-based metric, however, it's impossible to ignore Duncan's dominance.
Before writing off the numerous titles to better supporting casts, remember that Duncan was willing to defer to those supporting casts even when it wasn't necessary for him to do so.
He's sacrificed personal accolades for the betterment of his team, and any statistical comparison should take that into account.
The best of the best do their work in the playoffs—where regular season averages don't count for much.