#4 Dolph Ziggler
A staple of WWE since his main roster debut in 2008 (or 2005, if you include the Spirit Squad), Dolph Ziggler has done plenty in his career.
A two-time World Champion, Ziggler is also a former US and Intercontinental Champion, Tag Team Champion, and was the 2012 SmackDown Money in the Bank winner.
It's hard to imagine Ziggler anywhere but WWE, though All Elite Wrestling could be an excellent alternative for the Show-Off.
Now at 38-years-old, it's blatant that the company do not see Ziggler as the next top guy, though he could be given his time to shine in AEW.
Perhaps AEW could give Ziggler the chance to be a World Champion again, and (unless he is struck down with another injury like the one during his 2013 reign), could finally be given a proper reign.