I will say it's definitely fair thinking there could still be more regular-world play when you first arrive in Scala ad Caelum, but as soon as I went from the armored dudes to furry Xehanort I realized it was definitely final boss time.That's because they showed the logo for Scala ad Caelum and I thought I was going to go through an entire final dungeon. It literally went straight from that battle with those shadow things, then to armored Xehanort, then to the rest of the game. I thought I was going to have an opportunity to save somewhere in between. It wasn't until I beat armored Xehanort and immediately got thrusted into the battle on top of the castle that I realized this was it.