Blake Shelton could be the reason for JAF's success
Nope.
I mean, he's part of it. But it's not like any of HIS songs smash like this either.
I wouldn't be surprised if his people are pushing Xtina to make this song a single as well. It's a good opportunity for both of them. For Christina it's an opportunity to get back on top with a song that SHE has top billing on. For Blake it's an opportunity to crossover and reach a bigger audience. He's the King of Country right now, but Pop and the global market still don't know who the hell he is.
EDIT: Speaking of Xtina, new promo shot: