How do you think the heart hotel members reacted to Sora disappeared at the end of kh3? Do you think they felt the exact moment it happened?
Well, something I've talked about before is that a lot of how Sora acts at the end of KH3-- screaming about if he's alone then he's worthless- like, this comes on the tail end of his first experiences with the universe after losing Ven. After losing Xion, even if he's not aware of that.
These are three people who have been in his heart for minimum a year, who are so tightly bound to him in a very metaphysical sense that like, you can toss forward theories like "rage form is Sora taking their pain and dishing it out against the universe" and that's a solid theory. So when it comes to how they reacted, how they felt?
Empty. The moment it happened, it wasn't a snap. It wasn't a tear. He was there and then he was gone. A hollow, where Sora's presence always was. And they didn't get forewarning, they didn't have time to prepare.
Suddenly something intrinsic to them is missing and I think, at the least, Ventus and Xion collapsed into tears. I think Roxas would've started screaming. I think he would've snapped.
Where is my Somebody, snapped. Scorched earth snapped. Because it's easier to be angry than it is to collapse.
Anyway yeah none of them would've been okay in the slightest.