#3 Lars Sullivan
You might not expect someone like Lars Sullivan on a list like this because of his size. Vince McMahon loves guys like him, as they are behemoth and can squash smaller guys. But despite that fact, it is easy to point out other big men who have failed on the main roster in the past two decades or so.
These superstars include Nathan Jones, Snitsky, Jon Heidenreich, Vladimir Kozlov, Mason Ryan, Ryback, Brodus Clay, and many more.
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Sullivan has a throwback look, and he really is a powerful dude. He has to work on his promo skills like Ricochet, but he won't likely be a talker on the main roster. He needs to be booked properly like Braun Strowman who has dominated in the past year and a half. Sullivan could be a threat to The Monster Among Men if he makes his main roster debut next year.
But don't be surprised if Vince becomes disinterested in him, and puts him in a comedy gimmick, just like Kozlov and former world champion, The Great Khali.