Yeah, that's true. After the suntown thing, I was given the choice wehter to lie to the bat king (that Bass kidnapped her before we arrived) or to follow Bass to Deep cave or whatever it was called.
Since I didn't know where Deep Cave is , I went to the last thing I rememberred that was relevant for the quest:
The bat king guy.
Everything after that more or less followed a straight path.
So searching for the deep cave would have lead me to other endings?
Damn it, getting back through that insane amount of enemies without that other girl is impossible, so that's it I guess.
Althoug I regret that I still haven't gotten all the weapons to destroy the different blocks , for example the dragon martial arts skill from the central cave area. :-/