I like Rockhold. A fight against Vitor would be his greatest challenge thus far. I don't see him faring well unless he can do what Bisping failed to do. The only way I see him beating Vitor, being the athlete that he is, is to outwork Vitor, pressure him, and win a decision.
If he can survive three rounds, then I believe the fight would be his. I don't see it happening though. Rockhold should fight someone else upon his debut.
"And so faintly you came tapping, tapping at my chamber door..."