"Maybe I've just accepted it," Riku admits thoughtfully, "That we're here. The explanation doesn't really make a difference." Whether it's portals or whatever, or whose fault that is. Riku is realizing he's stopped caring about that a while ago. Is that bad? Should he be more angry?

Or has it become a dissonant note rendered meaningless in a ceaseless cacophony of other, louder, more disruptive experiences? It's like recovering from injuries. Sometimes you ache all over so much that you can't really care about a splinter no matter how it throbs.

"I think the idea that Xion was here, possibly away from the friends who were so important to her, so long ago is the part that bothers me the most."

She was supposed to be with her friends, they were supposed to live out their new lives in that town together. Not languishing in the dark, only to be reset.