#3 Finn Balor
There is no doubt that Finn Balor is a major fan favorite. He gets a solid reaction every time he steps through the curtain. Hopefully, he finds new life on SmackDown and can enter the WWE title picture.
Balor would be a good option as SmackDown's top heel. I don't think Roman Reigns will be a heel any time soon and Kevin Owens is really over as a face at the moment. Gallows and Anderson are still on SmackDown (for the time being), so a Balor Club reunion could be on the cards. A short run as a faction could really boost Balor's popularity and sell merchandise.
Balor would be a perfect choice to have waiting in the wings with the briefcase, could you imagine the pop when eventually cashed in? He also really deserves a second run with a major championship after his first came to such an unfortunate end.