Fellow Power Force member Eric Berry of Ranger Command Power Hour has an inspirational theory on the use of previously non-Power Rangers (Dairanger and any Sentai before Zyuranger) used in Super Megaforce. A while back in Dino Thunder, specifically episode "Bully for Ethan," Tommy had files with logos of pre-Zyu teams like Liveman, Changeman, Maskman, Goggle V, Flashman and After-Zyu like Dairanger. So one fan-theory can be that these teams are somehow canon in Power Rangers. Since Dairanger, Liveman and Flashman have been seen, these are excusable. So if they use any other team (like Jetman or Turboranger), then that defeats this theory. Above image I found on Deviantart but couldn't find who made it. But the logos are clearly from my website as I scanned them from a book that had blue background.
Now so far in Super Megaforce, we have seen...
Gia has become Yellow Mask of Maskman.
Emma has become Pink Flash of Flashman.
Green Flash of Flashman in "Power of Six"
"Legendary Squadron"
Dairanger have been dubbed "Legendary Squadron." Four of them appear in "Earth Fights Back," Troy becomes Red in "Samurai Surprise," and all five appear in "The Perfect Storm." Orion becomes "Mighty Morphin White Ranger" without any connection to the team mentioned. (In Japan, they were all the same team of Dairanger)

Turboranger has only appeared for a few seconds. They appeared briefly in "A Lion's Alliance" where the Rangers fall off the Anamarium and when the Rangers turn into Saban's Turbo (Carranger) in "Love is in the Air" and we see Jake hold the Turbo Black key. But I don't count them.
For More changes, Spoilers when you press 'Read More'

Turboranger has only appeared for a few seconds. They appeared briefly in "A Lion's Alliance" where the Rangers fall off the Anamarium and when the Rangers turn into Saban's Turbo (Carranger) in "Love is in the Air" and we see Jake hold the Turbo Black key. But I don't count them.
For More changes, Spoilers when you press 'Read More'
My Questions
- Was it planned ahead which Sentai would be used?
- If it wasn't planned ahead of time, did they then planned to do the full team?
- Do the producers refer them by their Sentai names and did they have to clear rights?
One reason they could had used this teams was there was no budget to remove them and replace them with existing Power Rangers. One theory that can be that the Sentai was used wasn't planned, that scripts were re-written at last minute. I think what happened was that with whole thing of using the Megaforce (Goseiger) suits before transforming into Super Megaforce (Gokaiger) suits, ate up the budget. What they could have done was they lost the Megaforce powers and they became keys and just use the Super Megaforce powers so they didn't have to shoot new footage of Megaforce Rangers fighting X-Borgs or have the awkwardness of Robo Knight on Orion's Gold Armor chest. Also. you see the all-Green photo above? Even though only two were Power Rangers, given two were already used in SM like Dairanger and Flashman, I think this might be used. Episode Description of "Emperor Marvo" suggests Damaras will be defeated, the Japanese footage with that has the Gokaiger becoming Shurikenger/Green Samurai Ranger (NS), Green Flash, Midoranger, Denji Green, Shinken Green/Green Samurai Ranger and Shishiranger. Goranger and Denjiman suits are kind of old and strange looking but oh well, they have done stranger things. Or they could be replaced like Megaforce Red was replaced with Operation Overdrive Red in "Super Megaforce" episode.