When I listed to the actual interview with McD, vs. just the printed quotes, it came off to me that McD is excited about Cooper, but also wants to be careful not to sound like "phew, now we have an actual NFL WR", by downplaying it and talking about the other guys in the WR room, and how it isn't about just one guy, it's a team, etc. I don't think there is any sort of rift between GM and HC.