I have no idea what your logic there is. Cat and Bear are at 6%, but Prot Warrior and 1h Fury are at 0%?
How in Thrall's name does Thunderfury not count for Prot Warrior (That's how I was introduced to it, and I'm sure many many many more: as a tanking weapon), but Sulfuras counts for Feral? Hunters are the second highest? If you're actually counting Thunderfury for Hunters and not shield tanks, I tip my hat to you sir, that graph took some serious balls...because that's the most ludicrous bald-faced lie I think I've ever seen presented in graph form.
Oh, and 1h Warriors/Death Knights: Ever heard of Warglaives of Azzinoth?