#2 Rey Mysterio debuts on SmackDown Live

Rey Mysterio was a member of the SmackDown Six and helped develop the blue brand. However, in 2015, Mysterio left WWE. Outside WWE Mysterio spent time performing almost with every independent promotion. His most recent independent PPV was with All In, see video below. This month it was announced Mysterio had resigned with WWE.
Sting in WWE once again? More details HERE
Mysterio's return to WWE affords a plethora of possibilities. Firstly, he could work with upcoming talent. Secondly, his presence brings back an element of nostalgia for fans. Therefore, what direction will WWE provide for Mysterio?
An excellent way to debut Mysterio is at SmackDown Live's 1000th episode. It would benefit the show due to Mysterio's extensive history with the brand, see video below. Moreover, there are a plethora of opponents for Mysterio. For example; Andrade Cien Almas, Daniel Bryan, AJ Styles, or The Miz. Ultimately, the roster highly benefits from his presence.
Who will face off with Rey Mysterio?