#1 What if Ambrose never comes back?
Dean Ambrose is set to leave WWE anytime soon, possibly after WrestleMania. He had requested his release weeks ago and rumour has it that this might be a work.
In case if this isn't an angle, Dean will be gone from the company after Mania. From what we have heard so far, he wasn't too pleased with the creative direction his character was going towards. He has been smart with his savings and apparently doesn't need to work where he doesn't feel like he's growing as a Superstar.
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No matter what happens after Dean's exit- whether he joins AEW or goes back to the Indies- there's a possibility that he would never come back again. This won't fare well with the higher-ups in WWE, as a Shield reunion without one of the key members of the faction is ridiculous and a waste of time.