Board Thread:Warhammer 40k General Discussion/@comment-27890440-20160301095334/@comment-9676764-20160301173737

Geoffreycoconut wrote: And that kids, is what really happened to the missing two primarchs I'd always wondered.

But yeah, I always assumed a space marine would always be better fighters than all humans (and most of the other races) regardless of training, but if one decided to be incredibly lazy for some reason, he wouldn't do very well against other astartes (and some of the other races that are also good at fighting).