GW News: LAS VEGAS OPEN 2025

This discussion gives credence as to why it might have been retconned in the first place. It wasn't a major part of canon to begin with. I never came across the actual source material and only heard of it via the internet. That said, it could have been neat and they could have introduced a more badass champion of chaos who finishes the job that Grimgor started and takes up the mantle of the fourteenth Everchosen.

In the end, it doesn't matter one way or the other.