#6 and #5 Luke Gallows and Karl Anderson

While it's quite interesting that both Luke Gallows and Karl Anderson were part of the now-famous Boneyard Match at WrestleMania 36 attacking The Undertaker on behalf of AJ Styles, they now see themselves being released from WWE.
Moreover, it was reported last year that the duo re-signed with the company to five-year deals. It's surprising, but while it's unfortunate, there is some precedence that they could go to AEW.
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Both men were in the Bullet Club in NJPW alongside Styles and The Young Bucks. It's not wrong that those pre-existing relationships could turn into real opportunities within AEW.
Like The Revival, Gallows and Anderson offer an old-school hard-hitting style that would serve AEW well and offer the variety that is possibly lacking with the daredevil styles of The Lucha Bros, Private Party, and SCU.
Throw in the Bullet Club connection, and there is a significant possibility that they are added to the company and it would make sense in the long run if everything comes to pass.