#2 WWE needs an out for Seth Rollins at SummerSlam
As much as the WWE Universe wants to see Dominik Mysterio defeat Seth Rollins clean at SummerSlam, the result would hurt one of the company's biggest heels. It might even severely diminish the value of Rollins's role on Monday Night RAW, which is something that WWE can't afford right now.
Again, fans wan't to see Dominik beat Seth Rollins, and while that is a possibility, WWE still needs to find a way to protect the former Universal Champion in defeat. Otherwise, Rollins will have to lose to someone who hasn't even been on the roster for that long and is years away from becoming an established figure in WWE.
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Dominik is somewhat thriving in his role of upholding his family's honor, but he still lacks the personality and in-ring skills to justify a big win. That's why WWE needs to give Rollins an out at SummerSlam and an easy way to do that would be to bring Mysterio back to protect his son.