What can Rey Mysterio do for GFW?

For the past few weeks there have been huge rumors about Rey Mysterio joining Global Force Wrestling which to be honest, is a pretty realistic rumor. Rey has not being doing much apart from Lucha Underground which is simply not as popular any more, and his relatively small involvement with The Crash in Mexico.
So, if Rey actually showed up in GFW, how much of an impact can he make?
It doesn’t matter how you look at it, Rey is already a big name in the wrestling world. That’s why when