We won't be able to see each other when we return, so there's plenty of that.

(And yet another piece of information that Ren has to spin, make as vague as possible - Akechi might not even be alive when they go back and finally destroy that cheap, unacceptable excuse of a reality. From what Akechi had described, it's enfuriating... And there's that choice Akechi had him promise to take. Defeat Maruki, regardless of what happens to him. As per always, it falls on Ren's shoulders to take the important decisions and he has.)

I think he made his decision that very moment. He's just being a pain. (Because the fight for control between them is a never-ending one, even at times like this. Of course Akechi can't just give him a straight answer.)

We have theories, but no more than that.

(That the Void is basically the Metaverse created by a God who doesn't know how to Metaverse. That's about it.)