[TokuChris]

I think Jason Geiger (Austin St John) leaving would have happened anyways. He went by Austin because he was upset that the show had Jason David Frank and Jason Narvy as listed starring roles and that he wouldn't be the only "Jason" in the credits (per Jason David Frank). We also know per JDF that Geiger didn't like the "it's Morphin time" belonging to anyone but him. With JDF's rise in popularity, I assume Geiger would have demanded he be paid the most and get the most screen time for being the Red Ranger.

We also know he only came back in Zeo for money and a minor role in the movie. He said it was to take care of his sick mother but with all the stories about how dramatic and "in the spotlight" he was, one can only doubt the validity of his claims.

I think for Power Rangers to be where it's at today, those 3 had to leave.