I remember when Eli suffered a shoulder separation in 2007, he was expected to miss at least a month. Nevertheless, Eli took the field the following week and played. We got our shit kicked in by the Packers in an utterly embarrassing performance (I was at the game), but it spoke volumes on the type of competitor Eli was.
Not all injuries are created alike, but could you imagine that happening these days? Could you imagine a QB or any positional player playing the following week after suffering an injury like that?