Kingdom Hearts II Organizations re-battles

I made a little theorie of how you could come to the place where the re-battles are:
In the photo shown up some days ago ( http://www.kh-vids.net/photoplog/file.php?n=134&w=o ) on the left you could see that it's in hollow bastion, not in TWTNW like it's most logical. Nomura said in one interview that the re-battles were made for the people who think Sephiroth is too easy in KHII. Also, one of the latest updates say that maybe Sephiroth's HP bars will be increased to 16. In another interview, Nomura announced it wouldn't be easy to go to the re-battles.
So I think you will have to defeat a much more difficult Sephiroth first. And then, the place where the re-battles are will be opened (the foto looks like it could be the same place where you fight Sephiroth).

What do you think about this? Am i speculating too much?

 

I don't care if sephirot will be stronger i'll beat him the same way of KH2 and I'll find this place.

 

Its true, hes not going to be that much harder, trinity limit and ethers for the win.