It was originally reported at F4WOnline.com and later by Dave Meltzer on Wrestling Observer Radio that Sin Cara h as gotten major backstage heat following Raw for immediately quitting his match against Del Rio. As of right now, it's being said that he dislocated a finger and will undergo x-rays to make sure there isn't a fracture.
I'm not trying to judge Sin Cara harshly or anything, I've never had a dislocated finger so I don't know how painful it really is. However, if I'm not mistaken, Antonio Cesaro worked for quite a significant length of time with a couple of the fingers on one of his hands either dislocated, broken or had something torn. It was one of the three, I remember that much as they mentioned it numerous times and showed that it looked like the third & pinky fingers of his right hand were taped together. My point is that Cesaro showed a real degree of toughness by working through the injury and that's something that no doubt impresses both management and the other talent backstage.
As for Sin Cara himself, I think it's time to future endeavor the guy. There was a massive amount of hype about Sin Cara signing to WWE, given his star power as Mistico down in Mexico but, frankly, he hasn't lived up to that hype whatsoever. I just can't say I've been particularly impressed by the guy. He's athletic and he has some nice looking high spots, when he's not botching them, but that's all he's got.