Just that when balefire undoes the past, it doesn't undo people's memory's of the past, so if the link is to the mind, that might not be reset by balefire
We also don't seem to know much about the new version of time - Taim balefires the Aes Sedai and the past ten minutes have been undone, which...
I don't think they mention one missing, but they do have one going through a gateway Androl opens. I don't think it says where he opened it to, but I could be wrong on that.
Egwene does indeed think that after Taim balefires a large number of Aes Sedai, that it will be a setback not just because of their loss, but because the people they had killed will be returned
edited after Keelinna's correction