Something that is dogging me that I have to lay to rest is the relationship between Space Hulk and LOS.
The only connection is the format.
Boards, miniatures, combat. . . that is it, in a sci-fi setting.
There were plenty of pre-cursors to the format, so no one can really ***** that I was less than original.
Admitedly, there are parallels with hive-mind bio-nasties replaced by hive-mind mechano-nasties.
But the fundamental difference is that 40K was a port from a fantasy combat game while LOS was designed out of whole cloth by an army sergeant to largely simulate modern combat.
On that level, there is no comparison IMO.