#1 AJ Styles

Just like Randy Orton, AJ Styles too can make any opponent look really good. Yes, The Phenomenal One did suffer a huge loss at the hands of The Undertaker in the Boneyard Match. But if there's one thing we know about Styles, it's that he keeps coming back for more.
Now, Styles might not look like a huge threat to Drew McIntyre but bring The Good Brothers into the fray and the equation just changes. Additionally, AJ is simply too impeccable at getting the audience invested into a feud with his mic work. Just look at his feud with The Deadman – he made it so personal that it drew the ire of fans themselves, let alone The Undertaker.
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Styles does not need to prove anything in the world of pro wrestling and has been happy putting over opponents in the last couple of years. He's also made his intentions of exiting the company in the near future very clear. So this could be his final run in the WWE where he could take a monumental loss to finally ebb away into oblivion while establishing McIntyre as a bonafide WWE Champion at the same time.