It might be useful for WWE to consider the possibility of turning Seth Rollins heel. He is doing surprisingly well as a face, but it simply cannot be argued that he has done his best work as a heel. It is completely understandable why WWE is opting to keep Seth as a babyface, as he is in a state of constant paranoia with the possibility of a Brock Lesnar cash-in looming, but WWE may want to seriously look into turning him heel again once that threat dissipates.
There is just a very cool and authentic quality about that slow, maniacal laugh. If this were to take place, it would also foretell of a Becky Lynch heel turn since WWE typically likes to keep couples on the same side of the face-heel dynamic. This shouldn’t be very difficult since she is basically already a heel, kind of like Stone Cold Steve Austin back in the day.