FF7 Rebirth ending speculation/discussion (spoilers obviously)

So is cloud basically a cetra now? I only ask because I think he’s experiencing the world the way Aerith sees it. Throughout the games she has said she doesn’t like the open sky. She prefers being in the slums with the metal sky over head or underground or under Junon. Is that because she’s always seen the fractured sky we see at the end of Rebirth.

Also are Cloud and aerith living in a juxtaposition of multiple realities? Is that what being a cetra means? It seems like aerith is simultaneously both alive and dead. Cloud being the only one who can see her as alive because he can see multiple realities now?

Or am I reading too much into it and cloud has simply lost his freaking mind and is imagining all of it?

Lastly sepheroth opened what I call the “portal of possibilities” in the remake which allowed our hero’s to change fate. In rebirth he explained that doing so creates “myriad worlds” but now wants to reunite them? Why create them in the first place then? Also they do it again in rebirth at the very end (with Vincent’s help) which allowed Cloud to get to aerith before sepheroth (and kinda save her?).

I’m just trying to make sense of the ending and am open to your interpretation. Seems to me the game is heading into an everything everywhere all at once kind of thing! (Watch that movie to understand what I mean)