[Goldar's Revenge]

Miki is mostly right . But the fan write in stuff and Cybertron happened before Tommy's first return. " Green No More " was meant as a write off for the Green Powers, not Tommy. Once they brought Tommy back, Jason Frank was brought back as a full timer. Who just had to transition to new powers.

There was supposedly a point where Brad Hawkens was in the running for White Ranger. But that came from Frank whose memory is known for not being very good. The timeline for that is more hazy. But Tommy was sticking around indefinitely by the Zyu 2 episodes.