#3 Daniel Bryan
Daniel Bryan and Kenny Omega actually had a match when both were in WWE's developmental system in the mid-2000s, but not since then, and never a major televised match. It's a true dream match, and one Omega himself is probably thinking about.
It certainly helps that Daniel Bryan is the current WWE Champion and doing some of his career-best work after his transformation into the NEW Daniel Bryan. The stars are aligned even more when you consider that, after he's done with AJ Styles at the Royal Rumble, Daniel Bryan has no real formidable challenger going into WrestleMania. Mustafa Ali is promising, but not there yet.
A Kenny Omega debut makes all of those stars align. The two could have an intense personal rivalry, with Bryan declaring the fans FICKLE for daring to anoint a total unknown (by WWE standards) as their chosen hero and champion.
Everything would be in place for one of the best WWE Championship matches in WrestleMania history. Omega winning the title in his first match would certainly cement him as the next big thing.