I didn't get the Only Mine sweater - may try it at some point, if still available by the time I decide.
I've noticed that a lot of the NAS items go on sale again, fairly soon after NAS finishes, but I don't see it as undermining NAS - just a lucky break for me because I'm slow to make up my mind which items I'd like to try. One thing though ...I bought a nice blouse awhile back, which I don't think was part of NAS, and I waited until it went on sale. Thing was? It was too big on me and by the time I got the blouse and decided to return it for a smaller size, the size I wanted to try was gone. There are other items I've bought from Nordstrom that went way down in price after I bought them, but ...I can't always get the size or colour I want by the time something's on sale. So to me, NAS is a great opportunity to get the newest, latest things in advance of the season, all on sale. I think this is a wonderful idea - much better than waiting for "end of season" type sales.
If it's something you really want, then it's a good idea to snap it up. Meanwhile, you will see other NAS items go on sale, go on further sale, possibly even see them at the Rack etc., but these are just lucky breaks, and you can't count on getting what you really want by waiting too long. If not at NAS, then some things will be "the one that got away" if you know what I mean
Hope you try the sweater. Sounds like it's on sale now, for a similar price as during NAS. It could even go on sale further...but then, the colour/size you want might be gone. Or, it might sell out completely.