#3 Brock Lesnar
WWE currently seems to enjoy forcing rivals to team up with each other. As touched upon previously they are currently doing that with John Cena and Roman Reigns, plus on Raw recently, bitter enemies Alexa Bliss and Sasha Banks were forced to pair up.
There would be no tag team on the roster right now -- or maybe ever -- more destructive if Brock Lesnar and The Big Dog were forced to team up.
All signs point towards the two of them clashing once again at WrestleMania 34, so with the current pattern, it wouldn't be beyond the realms of impossibility to see a Brock and Roman coalition. "The Beast" doesn't tag very often though, and he would likely take a lot of convincing to do so.
Edited by Nishant Jayaram