If I recall correctly, Body Guard takes the kill for someone so that they don't die. It's possible that if that's the way it functioned, the current take on Night Kills wouldn't' be inconsistent with it. It just means that Orihime chose some crappy targets to protect.
Mind you though, I think I regret bringing up that speculation. It doesn't really prove anything, and even if we determined the role, Orihme wasn't vocal enough to really make any use of it.