Hi. If I remember correctly, Vance wore that costume going from their second appearance on. As you pointed out, the 90s is when they rose to more mainstream fame. It was at the same time as the New Warriors. In that series it was shown how Starhawk was manipulating events to form the team so he’s in a “original” in the same vein of Cap being an “original” Avenger. The fact still remains that Vance with the Cap Shield is popular enough to get figures made of him. Especially since he was also a part of the StarLord GOTG series. He, Angelica, and Nova are the three Warriors that would be able to be made outside of the existing 6 to get us to the goal: a complete original lineup of Warriors. But, two of those three are needed to help sell the set. Ideally, Vance and Angel would come with pack ins to make Spitfire and Major Astro.
If there was a Namor set then yes, Nita works there. Speedball could go in a Spider-Man set as he was associated with him. An X-men set or a Spidey set could have Firestar. Etc. the only character that is stuck in the Warriors Wave would be Night Thrasher. Lastly, DST has to be watching what Legends does and sadly blue Nita was a peg Warmer.