#3 Elias
If WWE wants to launch Elias as one of their newest, hottest Superstars, then having him go one-on-one with "The Great One" at WrestleMania 35 might be the way to go, especially if The Rock doesn't mind doing the favors for Elias.
Over the last month, Elias has done several radio interviews where he's called out The Rock, and during a recent episode of Monday Night Raw, he challenged the former WWE World Heavyweight Champion to come back to the company with his guitar.
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Of course, The Rock has been made music somewhat a part of his character, as he's done several "Rock Concerts" on WWE television on top of doing other segments involving his guitar backstage.
So, this does seem like it would be a pretty entertaining feud, although I'm not sure if the match in the ring will be as good as the build for it.