That could work. Since Yuki is like... computer-y she'd be able to actually analyze voice samples like the computer in the Batcave, not just say "they sound really alike". :3 - And also point out the entries in which Riful gave hints to where she was moving. That wouldn't be a problem for her either.

I'll talk to Kyonmun today and see if they want in on this plot and get back to you later today.