[AkibaSilver]

My brain, as soon as it hears the word "multiverse": So we know, because of Forever Red and Once a Ranger that the first 15 series (MMPR to OO) take place in the same reality, and RPM has to be seperate. Super Megaforce probably brings Samurai and Megaforce into the same continuity, given the presence of Casey et al. DC is probably seperate, because they screwed up and got their Earth sucked into a Black Hole. There's also the parallel reality where the original MMPR movie exists, as well as the MMPR 2017 movie. Masked Rider is simultaneously within the "main" reality, and also a TV show in Time Force.

Basically, I'm waiting to see where they go with this. I'm sure, no matter what happens, we can handwave it away due to Time Travel.