[Flare Phoenix]

Make the various villains of Goseiger part of the Zangyack, and make it all their first wave of attacks. Then when the main forces attack, have them upgrade to the Gokaiger powers and go from there.

The main problem, as I see it, is how you justify certain powers getting used. Why would they use the Morphin Powers when say the Zeo Powers are specifically stated as being more powerful. It's a problem unique to Power Rangers, because a lot of the powers were compared in ways they were never originally meant to. It made sense for the Gokaigers to take on different Ranger powers, because it was assumed each set of Rangers were largely similar in skill and power. It's different for Power Rangers.

Still, I would like to go back to the MMPR days where characters spanned multiple seasons and storylines. It would be nice to get characters as memorable as Tommy or Adam (seriously, none of the new characters really have a chance at any kind of legacy since they're only around for one season).