But even still with Yes there was only 1 new member in the band for 90125. But if you want to exclude it and consider Union to be the ruinion then I'd still count Yes since The Ladder, Magnification, and Fly From Here are all post-Union albums I like a lot.
And For KC does Thrack count as a reunion album since they broke up after the 80s albums and all the members got back together?
Things get really fuzzy when you start being particular about band lineups. Personally I don't think membership should matter. As long as they're using the same name and they broke up and got back together I'd consider that to be a reunion. (like what about cases where the band only has 1 or 2 important members reuniting with a different backing band?)
The drastically-different-band reunion and the picked-up-where-they-left-off reunion are just two different sub-categories of reunion to me.