Did Rolf and the others survive?

[Zucca]

There was always a theory that went around that Tyler lent a hand in taking down the spaceship Noah from outside. He was probably under orders from Lutz to wait until Dark Force and Mother Brain were defeated until he would make his move.

I need to refresh my memory... In PSIV there's the Tyler's grave. Is there any relevant information?

[zio_falz]

You heard Lutz:

"You can't return again!"

The remaining question is, how did the Aeroprism and Neisword/Elsydeon return then.

You can return again, but your items can.