#3 A mini-victory over AEW
Whether they would like to admit it publicly or not, WWE has been hit by the emergence of AEW. All Elite until now has made all the right noises and has snapped up some good names as well.
They've signed up probably the biggest star and the most wanted guy in wrestling - Kenny Omega, and are slowly building up a roster which could potentially challenge WWE's monopoly in the game.
If WWE loses out on Dean Ambrose, he would be snapped up by AEW and that would be a massive loss for the company. Dean re-signing gives WWE a slight boost which they can use as a motivation to kick on further.
AEW has grown from strength to strength and has proven to be an attractive alternative to WWE, Dean re-signing would surely put WWE back in a positive light.