[FairyKing]

Didn't Go-Onger already have a plot that centered on multiple worlds where both the Rangers' powers and their enemies came to Earth from the Machine World? Other worlds seem to be a pretty common element in Sentai, but this theory about Zenkaiger sounds reeeeally similar. Of course Sentai has never been shy about re-using ideas, but I doubt they'd copy the whole concept of a previous series, unless it was either a sequel or a radically different take on the concept.

Maybe Zenkaiger will be a dark and gritty series (at least by Sentai standards) set in a post-apocalyptic world... and then the Power Rangers adaptation will be light and goofy.