What is Katy's "legacy"? She tied a Billboard record that the GP doesn't care about because the GP doesn't care about chart numbers and nobody seriously refers to her as the female MJ. Katy's vocal abilities aren't anything memorable, whereas Kelly has been recognized by both the pop and country worlds for her talents. Not to mention, Katy her album sales have yet to outsell Breakaway alone WW. Kelly even got a WW smash while sitting in a chair on a flop TV show not doing promo.
Just because TD was recent (and well-executed, I admit), everyone will vote for KP. But KC is severely underrated, her GH sales prove that.