#2 Kazuchika Okada
There was a real danger, at one point in time, that Kazuchika Okada would never make it in pro wrestling. Or, at least, that he wouldn't turn into the huge star that he is today.
A 2010-11 run in TNA almost killed Okada's career, as the American company abysmally misused the young up-and-comer. However, he returned to NJPW, created the "Rainmaker" persona that he has now made so famous, and the rest is history.
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Kenny Omega and possibly AJ Styles aside, Okada is currently on a different level than any superstar in the world. Everything he's done in NJPW over the past few years has been fantastic, as he's been settling into the role of becoming the top guy in the company.
For a guy who doesn't even turn 30 until November, an incredible amount of trust has been shown in him, a sign that he's more than capable of carrying the main event in a big promotion.
Okada simply has to try his fare in WWE at some point in his career. He's simply too talented, has too much to give, to allow himself to miss out on the opportunity.