#3 Dean Ambrose
Dean Ambrose has been on the sidelines through injury for quite some time now, and to be honest, that's exactly what he needed.
While he was enjoying something of a resurgence courtesy of The Shield's reunion, it still didn't really feel like he was on par with Reigns and Rollins. When he returns, WWE needs to take some steps towards giving him a full-on character change.
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He needs to lose the vest and the jeans, and ideally, he'll revert back to a leather jacket and tights which is what he wore during his golden FCW days.
Instead of having Dean be 'unhinged' in a PG kind of way, make him go all out and start losing his mind by attacking random superstars. If he feels like a genuine psychopath, then that uncomfortable feeling could lead to some great heat for him.