I figured he'd be the slight favorite for Vegas odds. He's riding a huge wave of momentum, and he just knocked Aldo the F out in 13 seconds. Hell, if I'm Vegas, I favor him as well, even if he's moving up to face the LW champ.
I'm guessing a lot of people or Vegas are banking on RDA starting off super aggressive, and Conor catching him early, then taking over from there, and Conor getting in RDA's head enough to have him fight off his emotions, and not follow his game plan, throwing all caution to the wind to get an emphatic KO to make him pay for the traitor, and comments about his kids.