Okay, this is how I view the Kamen Rider Multiverse:

- The Showa Riders are explicitly in the same universe.
- Kuuga and Agito are in the same universe, since the G-series was based on Kuuga, and built to fight the Grongi.
- Ryuki could be in any universe, because its ending retcons it out of existence
- Den-O and Kiva are in the same universe, as seen in Climax Deka.
- Decade is Decade, nuff said.
- The other Phase 1 Heisei Riders are in their own universes, minus Kabuto which appears to be the universe of The First and The Next.
- W-Wizard are in the same world, as seen many times, but I'll stick to the things seen in the actual shows. The King's Core Medals appeared in W 48, Kengo and Yuki appeared in OOO's finale, and Haruto appeared in Fourze's finale, unintentionally cockblocking Shun. In addition, since Kuuga, Ichigou, and Super-1 were seen in archive clips in the beginning of Fourze, that means that this World is the same one as the Showa Universe, and the Kuuga-Agito Universe
- Gaim is definitely in its own world, but the Sengoku Movie Battle might have still happened anyway since it was mainly in the Sengoku World. Nothing says Haruto came from the same world as Kouta.
- Drive...is tricky. Because Movie War Full Throttle is definitely canon to both series, but nobody mentions anything about the Helheim Invasion.

Which is why I said this:

How did you come to that conclusion?

Masaya Kikawada, the actor who plays Takeshi Hongo in The First/The Next, appears in character in Episode 14 of Kabuto and calls Souji "weird". It's more of an easter egg since Kabuto is the first show to air after The First, so they smuggled the actor of Takeshi Hongo in there.

I really havent seen Kabuto in a long while. Still the thing doesnt add up for the same reasons Kabuto doesnt fit with anyone else. In the First and the Next Shibuya is still intact and there is no evidence that it got destroyed.

I'm okay with the most overrated Kamen Rider being in the same universe as the most disappointing interpretations of the original 3 Showa Riders.

With the GataKiriBa combo Kamen Rider OOO can create clones of himself, but is there anything that suggests that the clones of the belt that are created from said combo aren't as functional as the original? Put more simply, is it at all possible for OOO to use GataKiriBa, clone himself than switch out the medals from that clone with say... Tajador or Sagozo?

That would be awesome if he/they could!!

yes. he does it in one of the movies.
pretty hype.

He does?! O_O

SUBARASHI! :D