#4 & #3 Zack Ryder and Curt Hawkins
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AEW's current tag team division is a really expansive one, comprising Superstars of every type. Be it the Best Friend, Lucha Bros, Young Bucks, Santana & Ortiz, The Butcher & The Blade, or even The Dark Order, each of these teams have seen some form of push in their time in the company.
Zack Ryder and Curt Hawkins have been far from effective in their current run in WWE. With the exception of Zack Ryder winning the Intercontinental and US titles, and the RAW Tag Team titles they won, they have gone back to their losing ways as of late. With Ryder and Hawkins both losing regularly in WWE, perhaps the time has come for them to have a change of scenery.
Going to AEW would allow them time on the roster. Both men actually have quite respectable chemistry with each other, having teamed before as well. Now, they could have a solid run in AEW, as there are more than enough tag teams for them to actually feud with on the roster.