Yea...there's only a handful of cameos in Super Megaforce. In fact, the only cameos so far have been Casey from Jungle Fury and Jaden and Ji from Samurai. Tommy, Cassie, TJ (both from In Space), Damon, Leo (from Lost Galaxy, the latter of which shocked fans), Carter, Dana (from Lightspeed Rescue), and Alex (from Time Force) are returning, but only for the final battle. It remains to be seen how they will handle the Turbo, Zeo, Black DinoThunder, and RPM powers.
Among the many problems with Megaforce is that Bandai was not allowed to skip Goseiger, so the first 20 episodes are an adaptation of that series while the final 20 episodes are an adaptation of Gokaiger (aka the big anniversary season). It doesn't help that this Ranger cast is by far the most boring and that the Gokaiger suits are merely power-ups instead of full-on new powers.