Fact check, Pierce led the Celtics in scoring in the 2007-08 regular season. Pierce also has a slightly higher OWS and slightly lower DWS. The two, based on statistics alone, are actually pretty close in terms of sharing the load. Put in Ray Allen, who wasn't that far off in OWS from PP and KG, and the load is pretty evenly spread.
Where as the 2011 Dirk led the Mavs in scoring by a significant margin (23ppg vs 15.8 in the regular season, 27.7 vs. 17.5 in the playoffs), led the team in OWS by a large margin (7.8 vs. 5.8 in RS, 3.6 vs. 2.7 in PO), and isn't that far off in defense (tied for 1st on team with 0.9 DWS in playoffs, and 3.3 vs. 3.9 in regular season, ranking 4th behind Kidd, Chandler and Marion).