#4 He should not return to WWE

There is no denying WWE will likely have interest in re-signing John Hennigan, if for no other reason than to keep him from landing in AEW, NJPW or another rival promotion.
Reports indicate that Hennigan is open to re-signing with WWE if the money is right, and he is also entertaining the idea of negotiating with All Elite Wrestling.
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However, at this point in time, signing with WWE might not be the best play for Hennigan.
For starters, the roster is extremely crowded in WWE right now, and with the company's track record of keeping John Hennigan out of the main event picture, the time might not be right for the former John Morrison to make his return.
Additionally, WWE has a history of limiting talents who return to the company having previously left for Impact Wrestling, and if Hennigan is looking to keep his momentum rolling after his Impact departure, WWE might not be the best place for him to land.