Storyline links between PSU, PSO and PS?

[Mirinee]

I'm fine with Rappies/Tech names/Grass Assassins because they're all very much the same thing with a slight variation, but as far as the planets go, I bet they are completely different. Parma was destroyed all the way back in PSII by the Earthmen.

I almost sure that SEED from PS IV isn't the same one as the one in PSO/PSU, which may very well be the same one . The SEED from PSIV was a computer which self-destructed itself. I know a little PS history, KIREEK I played PSIV again very recently too, so it's all fresh in my mind :S. I just haven't played PSIII.

Spoiler: The final boss offline is 'Dulk Fakis', who apart from having a similar name and being some kind of evil beasty has little to do with Dark Falz/Force or the Profound Darkness.

I always thought that the Dark Falz in PSO EpI was the same Dark Falz in all the PS games, though. It's supposed to be respawning every millenium. Are you sure that this 'evil beasty' is different?