#2. Samoa Joe
Samoa Joe has proven himself to be a great anti-hero babyface during his run with Kevin Owens but it's pretty obvious that he would make a much better heel. In fact, between his absolutely salvage skills on the microphone and his imposing size, he is much better off as a heel character.
And that's what eventually aligning himself with Seth Rollins and his group would do. It would also be a great way to make the WWE Universe feel betrayed by his eventual decision to join Rollins' group and get more heat on him than ever before. That would be perfect for Joe heading into WrestleMania season and allows WWE to do a slow turn.
In the end, Samoa Joe worked perfectly as a temporary babyface, but he is so much more convincing as a heel. It fits his style, it fits his character and ultimately, it fits his imposing physique. WWE can try to dress him up as a face all they want, but Joe can only go so far with that character set.