[FairyKing]

Since they did Beast Morphers after Ninja Steel, Hasbro has shown they can adapt Sentai seasons in a different order than the order they aired in, though I assume they still wouldn't adapt a really old season, just to avoid the designs and effects looking dated.

So if Zenkaiger does have literal references to past Sentai (instead of just having design nods to them like Boukenger's villains or the Lupin Collection pieces), Hasbro could just go back and adapt the seasons Disney skipped, and save Zenkaiger until after that. That approach could even let them plan more and put foreshadowing from one season to the next, and really build up the shared universe leading up to Zenkaiger.

Alternately, they could adapt Zenkaiger first, and explain appearances by skipped-over Sentai as either rangers from the future, rangers whose stories haven't been told yet, or brand new rangers whose chronological first appearance is their Zenkaiger-adaptation cameo, using that season to build up hype for future PR seasons or spin-offs adapting those skipped Sentai. Kinda like how some heroes in the MCU first appeared in some other hero's movie or an Avengers crossover before getting their own movies.