[TokuKnight89]

Quote:

Originally Posted by Tokumonkey

They've left it wholly vague. On the one hand, we saw Gai pleading with the ToQgers for the use of their keys. On the other hand, we also saw not just newer Sentai, but Jetman, Gaoranger, and Gekiranger. You could say that the Gokaigers went back and specifically asked those teams to use their keys again, but I think the real answer is "Toei handwaved it." I haven't re-watched the final episode of Gokaiger, yet; when Captain Marvelous returns the powers of the previous 34 Super Sentai, do we see the Ranger Keys actually disappear from the chest? If not, then they presumably never stopped working.

Regardless, the Gokaigers have been able to Gokai Change in all their movie appearances following the end of their series.

The Gokaiger did return the Keys, and most every other appearance had them essentially borrowing the Keys. Goseiger used their own, and then Hurricanger took their own back mid-series, they used them then returned them for the Gokaiger to use. Again confirmed in the finale, AkaRanger transformed. Keys can be used, returned, and borrowed.