#5 Dean Ambrose

It's still a big if whether Dean Ambrose is for sure leaving the WWE universe after his contract runs out but if he is then there's a legitimate reason behind it. He's been turned into a third wheel in his own stable "The Shield" and has been sometimes put in feuds which just don't make any sense.
Just, for instance, the former WWE Champion was left stranded in the pre-show at WrestleMania last year while his Shield buddies faced Triple H and Brock Lesnar respectively. The word "grossly mishandled" is perfect to describe how it has been for Ambrose. Even the recent heel turn was shambolically handled which ultimately tipped Dean over the edge.
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A switch to AEW would be great for both the parties because in Dean AEW would get a fresh face who could actually stick there for a long long time and for Dean it offers him an opportunity to try something new and try to fulfil his passion of wrestling, something he wasn't able to tap into for a while now..
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