Personally, I see reigns most at risk of the three Viper. Yes, Reigns has the size, but he's not THAT big compared many of the other big men they already have. You also have to take into account Big E being called up! Ambrose and Rollins don't really have THAT much competition in that regards. Reigns isn't amazing on the microphone and is definitely inferior to the other members. Finally, from what i've seen, Ambrose and Rollins have a pretty big following!