I somewhat think that Nynaeve hasn't really had a Big Moment for herself in the series, besides her earlier matches against Moghedien. Most of her Moments emphasize teamwork - nothing against that, but the Cleansing was a team effort with Rand leading, and the Malkieri thing was more about Lan. It's strange that her overall arc had her diminishing in importance after she overcame her Block (with help from Moghedien), but I never found her personality to be anything other than an active opposition to people around her, so there is very little of Nynaeve herself that I feel has been developed.