I've been thinking about this whole Roman thing... and I'm still 90% convinced this whole Roman thing is an elaborate work anyway, but...
Maybe it's for the best that he wins the title coming off this drug test. Maybe it's for the best that he wins the title and pins Ambrose and makes him look like a fluke and Michael Cole is screaming "FOUR TIME CHAMP THE BOYHOOD DREAM HAS COME TRUE!" and JBL forgets to be a heel and confetti flies and everyone's like BOOOOOOOOOOOOOOOOOOOO ROMAN ROIDS YOU DON'T DESERVE IT and his music plays and they seem so tone-deaf when trying to sell this as a huge moment and...
Orrrr, he can come back on his first day, win the belt by just destroying Ambrose. Repeat ADR and Dolph. Have him ragdoll the crap out of him and finally spear a carcass for the 3-count, have the commentators sell it as uncomfortable, even bring up roid rage if you want, and Reigns wins as an actual heel and not this overthought smark era bullcrap.