I doubt it would be easy to hid the presence of 13 Myrddraal from non-turned channelers, even somewhere as large as the BT grounds. Moving them to a remote location (town) makes some sense if they're trying to keep it on the sly.
It could be an Aiel from the future...one of Aviendha's children perhaps
It could be a Jenn Aiel - perhaps one of the last that has been hiding in a portal world or TAR until need (for TG/this purpose).
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