galaxy eyes question

I've recently had the newest cover card, galaxy eyes photon dragon on my mind a lot, but one question comes to mind:

It's effect involves removing from play itself and an opponent's monster until the next battle phase, so what would happen if dimension distortion was used in between then, say, in the main phase after you used GEPD's effect? Would the other monster be permanently removed from play, or would you just get back GEPD faster?

GEPD's effect banishes itself and opp's monster until the end of that Battle Phase, not until the next Battle Phase. So Dimension Distortion has nothing related to GEPD's effect.

Though to answer the question, if one of the monsters is no longer banished when they'd return, the other one still returns.