[He has thought of that...he just doesn't know how he could get around it in his survey...]
Well, if you're from the same world, but don't know each other, and yet cannot find any distinctive differences between your perceptions of how your world should be, then either you are from the same world, or from dimensions that are very closely tied together.
[Aidou's talk to himself more now, rambling.]
I should ask Sentience more about that once I have all the data I need...