The fact we're discussing this in a thread is an issue with FFXIV's overall storytelling.

I don't think it's Raubahn, because plot armor. It would sooner be Pipin.

I also agree that Y'shtola is safe. Her injury from the trailer is more than likely just a way to keep her from making the journey to Doma.

I expect Alphinaud to stay behind to keep the general Scion work, but he's less safe the Shtola.

That said, one scene with Gotsetsu and I immediately thought, "How long till you die horribly?" Since the last time we got a great Roe NPC, Moenbryda, she died one patch later. And Gotsestu is a bubbly, hornorable guy (like Haurchefant) and an old, grizzled veteran. I think he's doomed.