THIS BODY IS READY

[Niale]

That's it, that's his new body
Gather the clones, and there you go.
I mean, its something like that. I don't go too deep into it, but basically.

The game is fun though

No, that is is body he was born with, reborn in his coccon state "Rebirth Sephiroth". his "new bodies" are the bodies made of other JENOVA cells like the headless body or in Advent Children. The clones were killed for JENOVA Synthesis.

He has this body until you go to Northern Cavern, he doesn't change into the boss yet