Luckers: In Knife of Dreams Ch. 23, 'Call to a Sitting', Tiana notes that many of the women who are strong in Nynaeve’s method of Healing used to be village Wise Women. She wonders why that should make any difference, and indeed it does seem to imply that their life experience in some way affected their degree of Talent. How would this work out under the understanding of Talent as a soul ability? Does life experience change the strength of the Talent, whilst soul ability decides if you have it? Or should we make a distinction between Talents which are skills—like Healing, or that Shielding Talent Berowin of the Kin has—and Talents which are abilities—like Foretelling, Wolfbrothering or Dreaming?

Maria: Okay, let’s look at this. Why did these women choose to be village Wise Women? Maybe they haven’t sparked, but the Talent is there. They may not understand it, but they feel that they should be healing the sick. So, instead of life experience affecting the Talent, I think that it’s more that the Talent affects the life experience.
Also, Aes Sedai have been taught that Healing is done one way, and that way is the only proper way. It’s sort of like the gesture limitation; if an Aes Sedai learns to make weaves using gestures, she’ll have a really hard time making the weave without making the gesture. I think that the former Wise Women are more open to learning the new way, and that gives them another advantage at it.

I guess your theory may have merit