Nah, who does that, that's too easy. It's more likely that the GP's comic book collection was the key to unlocking a portal to an alternate universe where the h

Nah, who does that, that's too easy. It's more likely that the GP's comic book collection was the key to unlocking a portal to an alternate universe where the heroes had not been defeated, so the remaining heroes could go there, learn the secret of their victory and come back to rewind time and never have lost to their nemesis in the first place, which explains how the GP's comics were in the closet this whole time after having been stolen.