#3 Putting a new spin on old rivalries
AEW is home to many men Sting encountered during his time with WCW.
Sting had a heated rivalry early in his career with Arn Anderson and Tully Blanchard (while they were part of The Four Horseman). Sting also crossed paths with Jake "The Snake" Roberts, with the pair once headlining a WCW pay-per-view together.
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All of these men are now fixtures on AEW Dynamite. Also, AEW's televised shows are announced by Jim Ross and Tony Schiavone, the very same men who (between them) called all of Sting's WCW run.
All the elements are in place to make the return of a character like Sting feel special. Steve Borden may be 61-years-old, but once he puts the classic Sting facepaint on, his age is not what the fans are focused on.
Sting does not even need to actively wrestle. He could form an on-screen alliance with an active performer and join forces against an opponent managed by a fellow legend.
For example, Jake Roberts currently manages Lance Archer - and has enhanced "The Murderhawk Monster's" character in doing so. Sting could come to the aid of a younger wrestler and help them battle Archer and Roberts.
With so much history to play off of, there is definitely a place for an icon like Sting in AEW.