#4 Shinsuke Nakamura

What do you do when you hire a legitimate superstar from your rival promotion? You put them through the developmental route. What do you do when he not only wins the crowd but also outright proves himself? You put him on the main roster. But what do you do next with someone who is so eccentric and capable of pulling out 5-Star matches in the main roster? You do exactly what WWE didn't do.
Shinsuke Nakamura is a legitimate superstar but the way he's been treated at WWE is just horrible. One of the biggest reasons going around for that eventuality is the fact that the creative team is out of ideas of what to do with him. Which is a shock by all means because even if they followed the template used at NXT, Nakamura would have conquered the main roster as well.
Breaking Vince Russo and Jim Cornette update HERE.
There's no reason not to think that Nakamura's days at WWE are numbered (with the way he's getting booked for a while now). But there's also no reason not to think that AEW offers Nakamura a great opportunity to redeem himself after a more than an underwhelming stint at WWE. And who would want to see Kenny Omega and Shinsuke Nakamura go at it?
One wrong move ended Big E's career - Watch Here!