#2 Ali
Since leaving 205 Live, Ali's road has been covered in cracks and missed opportunities. Ali was taken out of the Elimination Chamber match earlier this year, which incidentally allowed Kofi Kingston to have two back-to-back star-making performances, and led to him capturing the WWE Championship at WrestleMania 35.
It's possible that what we saw what the path Ali was supposed to take. However, time waits for no-one, and the Heart of SmackDown Live was forced to miss his shot due to injury. Since then, he's given some pretty incredible performances but has come up short in big matches.
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At WWE Super Showdown, Ali may be coming in with something to prove.
#1 Drew McIntyre
The Scottish Psychopath certainly has his hands full at WWE Stomping Grounds with a match against Roman Reigns. Until then, though, he's not currently scheduled for anything at WWE Super Showdown. It's almost a guarantee that we'll see him interfere in Reigns' match with Shane McMahon, and he may intervene in the Usos/Revival bout as well.
Still, he won't be going there just to ruin two matches. He'll be there to prove to Reigns, the WWE roster, and the whole WWE Universe that he's not one to be trifled with. The former NXT Champion has been on a warpath since arriving on Raw last year.
Quickly capturing the Raw Tag Team Championship with Dolph Ziggler, McIntyre would move on into singles competition. Dean Ambrose, Seth Rollins, Kurt Angle, and Finn Balor have all fallen to the former Chosen One.
With the Revival, Elias and Shane McMahon backing him, it's hard not to put Drew McIntyre at #1 on this list.