They could be villains for a Super Megaforce special by using the VS movie footage?
Not sure they could go that route, unless they took a line from the Psycho Rangers and the Thunder Rangers subplots of In Space and Ninja Storm.
But that faces the issue of too many Rangers in terms of the entire Kyoryuger cast and the Gobusters combined together. It's very much that 5-15 rangers would be on the screen at any moment throughout the entire two to four seasons of the installment.
And considering how well they handle a single team of rangers, they'll only have half the character development that is like 7 Saban rangers. But since the other 5 Kyoryuger are cameos once or twice, it still means that they have to deal with ten rangers. And by the time of SPD, they didn't exactly handle the other three that were added after Shadow well at all.
Having a confrontational team would and proably be done for this:
-Gobuster RPM rangers have to get more energy for their colony in Africa. They don't know that the rest of the world has gotten a whole ton better since Venjix, and hardly know of the fact that there are another team of rangers. Since they need energy and know of aliens, they make a deal with some Kyoryu villains to get more energy for their colony.
-While they know there might be other humans outside their colony, they are hesistant, but agree.
-the Dino Charge team, being from a world that isn't hell on Earth, are more lax in their mission. They are show-offish and fight far differently than the second squad of RPM does, which fights for survival of their colony.
-Since the people in this new society are freer and have better lives, they dismiss the RPM rangers for the new team. Or they see how people live and are angered how they did not get any help from the world that forgot about them.
-Despite knowing now they might be evil, they still side with them to bring vengeance on the Dino Charge team and the world that insists on forgetting about the tragedies of the past and their contributions to global stability.
-_________
Hopefully, Dino Charge is set before Megaforce/SMF alongside SPD to make the timeline make a bit more sense. Perhaps after Samurai would be decent?
I'm thinking that , Samurai is in 2009 or 08 after Jungle Fury while RPM follows through within a couple years , and then Dino Charge and RPM Team 2 [Gobusters], ToQger , SPD and finally Megaforce and Time Force.
Here's a more linear list as to how I think the timeline could be:
Mystic Force-2006
Operation Overdrive-2007
Jungle Fury-2008
Samurai/Super Samurai-2009 [2011 if RPM is 2009-10.]
RPM-201x [may be before or after Samurai.]
Dino Charge/RPMBusters: 2014-15 [if Ranger keys, then after SMF]
Megaforce/Super Megaforce-2016-17
ToQger- after SMF or Dino Charge, so either 2018 or 2016.
I might be grasping at straws, but this could be the most logical give or take some details.