So the Death Commandos came and murdered the entire Grey clan about whom we knew nothing and cared even less, and who were "invented" just for that story.
Personally...I think Claremont bumped his head when he wrote Grey's End. It was a stupid and ultimately pointless arc that was only written for shock and awe but without any significant lasting impact or interest; because apart from "those people" being dead, nothing changed, for Jean or Rachel.