So I had to re-watch it again and I had an ah-ha moment about the opening scene with the Germans. Follow me here because I haven't got a precise memory for detail, mostly names. The interrogator has the names of the man's girlfriend/wife wrong, but you know/assume the guy is going to die anyway. (Pissing in his pants he knows he's a goner, so we know he's a goner.) Not the whole name but half of it, first name right, last name wrong...just like when Maurice got half of the name wrong when looking for the road Stussy lived on. So Ennis was killed because of the arrogance/stupidity of someone who at that moment had supreme power over another persons life.