As for the team in general they had 139, 289 and 79 yards, barely a drop off as far as I can see. No doubt Shockey is an intergral part but don't overstate things, I still rank the Giants second
In the NFC East I rate it like this.
Receiving: Witten, Cooley, Shockey
Blocking: Shockey, Witten, Cooley
Overall: Witten, Shockey, Cooley.
As these players so go the teams. I do think the addition of Fred Davis to the Redskins is very interesting and he could swap these rankings around.