There has been talk in this forum about Crawford having a concussion. There have been plenty of other people (media, twitter, bloggers, etc) reporting that Crawford most likely has a concussion. There was a play which many have identified that would cause a concussion.
In terms of Carcillo...right knee injury. Once again, reported by several people (media, twitter, bloggers, etc). Team will never confirm and call it a "lower body injury" but most people can tell based on the play and what has been reported.
In terms of your bold...exactly. However, I was disagreeing with you because early you said they were called concussions and not upper body injuries and you also said that it usually doesn't come out where the upper body injury is. So you flipped there on both of your statements.
In all honesty, this is probably conversation for another thread so I'll just leave it at that.