That's beside the point. It doesn't matter who's to be credited for the Cleansing (mostly Rand, certainly - most of Nynaeve's credit for it comes from accepting to collaborate - a huge deed in itself, but the rest is all Rand's initiatives), the significance of this event is intrinsically tied to the fact it's a mixed gender effort, the first in 3000 years, that began to undo the mistakes made in the AOL, and that was totally impossible unless men and women did what they had not done since the breaking: work the two halves of the OP together. Not representing Nynaeve, or saidin and saidar, removes pretty much all greater significance to the scene depicted.