#3 WWE need Rey Mysterio to tell the complete story at SummerSlam
While Seth Rollins versus Dominik Mysterio has all the makings of an instant classic at SummerSlam, it's pretty obvious that the Luchador's son is going to need some help in order to tell the full story. In fact, you almost can't tell the entire story of redemption with out Rey Mysterio coming back at this point.
Furthermore, Dominik seems to be struggling on the microphone, and although he does have a few decent one-liners here and there, he is just not capable of carrying this storyline on his own. Unfortunately for Rollins, he can't seem to get much out of Dominik either, thus why Mysterio is needed at SummerSlam.
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If nothing else, everything that is not up to mark with Dominik's character and in-ring skills can be fixed by his father making a late save at SummerSlam. At least that way, Dominick gets a passing of the torch moment, Rollins doesn't have to carry the storyline, and WWE can reinsert Mysterio into weekly programming.