#3 Allows for Rey Mysterio to introduce new and creative masks after WWE Extreme Rules 2020
As Charly Caruso said at the Horror Show at Extreme Rules, Rey Mysterio can retain his vision once again because the optic nerve wasn't completely severed during the course of the match. Until that happens, WWE has a chance to unleash a whole bunch of creative masks upon the world, each of which can become an interesting merchandising idea.
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Rey Mysterio's story with Seth Rollins is clearly far from done, so whether or not he appears in the ring for a while after WWE Extreme Rules, Dominik vs. Seth Rollins is still something that is definitely on the cards, in the coming weeks. Rey Mysterio has had some of the most creative masks over the years and now he can go one step further to hide the injury sustained at WWE Extreme Rules in a whole bunch of creative ways and WWE has the potential to sell each of them in their online store to Rey Mysterio fans.