As previously reported, it was believed backstage that sooner or later Mauro Ranallo would be back with WWE. The feeling WWE had about Mauro is that WWE wanted him “with them” rather than “against them.”
There is also a situation wherein if Ranallo left WWE forever, he would very likely have end up back with an MMA promotion like Bellator or New Japan. As we saw with what happened to the Jim Ross situation, WWE would not want him appearing on a high profile show for a rival promotion.
For what it’s worth, it was Triple H that was the major player in helping bring Mauro Ranallo back, just as he was with Bruno Sammartino before.
Source: Wrestling Observer Newsletter