[Tokumonkey]

Quote:

Originally Posted by Matrixbeast

Also, Gokaigers can't be the strongest Sentai because, once returning the keys, the past (And future) rangers either have to consent in giving them their powers for the keys, or they have to be stolen.
Unlike Decade, the Gokaigers' powers is dependent on the others already given up their power.

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.