#4 The return of Reigns
One of the main reasons that Dean Ambrose wanted to make an exit from WWE was because of Roman Reigns' recent health scare. In case you have been living under a rock all this time, Roman Reigns had to relinquish his Universal Championship in October because his leukemia had come back after eleven years. Ambrose is not close to a lot of people in the world, but he counts Reigns as among his best friends.
And then another report had surfaced that Roman Reigns was working on the Dean Ambrose situation, to convince The Lunatic Fringe to stick around with the company for a spell. Of course, this is not a guarantee that things worked out and Dean Ambrose decided to stay with the company.
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But at the same time, I'm guessing that Reigns worked his magic on Ambrose. And something tells me that Ambrose decided to stay on.