I like crack, and that was certainly trippy. Plus, I had fun trying to guess all the Rider movie villains.
It's entirely possible, and the problem is that time travel isn't actually well explained in Ryuki, compared to setting rules in Den-O (though not necessarily following them in later movies). Every time I try to explain it, I always come up with a new theory that makes just as much sense as anything else--"Leave Out All the Rest" was just lingering memories as in the Time Vent episode, "No Perfect Endings" was little Shiro's art getting ahead of him, "The Elephant in the Room" conveniently avoids bringing up that little pachyderm, and "13 Times" has its own explanation. I've got two chapters coming up in the future that will actually explain things. Suffice to say, the next time JK sees Momotaros and Ankh, he's going to yell at them a lot. But overall, given that Shinji seems to be the only Rider from his era who keeps returning, and given his lingering memories where Time Vent is concerned, it's entirely possible that he gets flashes of memory and takes up the deck and lets Den-O or Decade or whoever drag him along while he's still useful. Especially given how Ren and the others never seem to show up again after Let's Go Kamen Riders.
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It's entirely possible, and the problem is that time travel isn't actually well explained in Ryuki, compared to setting rules in Den-O (though not necessarily following them in later movies). Every time I try to explain it, I always come up with a new theory that makes just as much sense as anything else--"Leave Out All the Rest" was just lingering memories as in the Time Vent episode, "No Perfect Endings" was little Shiro's art getting ahead of him, "The Elephant in the Room" conveniently avoids bringing up that little pachyderm, and "13 Times" has its own explanation. I've got two chapters coming up in the future that will actually explain things. Suffice to say, the next time JK sees Momotaros and Ankh, he's going to yell at them a lot. But overall, given that Shinji seems to be the only Rider from his era who keeps returning, and given his lingering memories where Time Vent is concerned, it's entirely possible that he gets flashes of memory and takes up the deck and lets Den-O or Decade or whoever drag him along while he's still useful. Especially given how Ren and the others never seem to show up again after Let's Go Kamen Riders.