it's impressive to watch those guys play zone.. that hit kam chancellor put on welker, right after carrying the other receiver up the seam and handing him off when he saw welker coming across.. that's what we "should" be doing.
Yes. It also helped Kam that the DL was in position to make Manning decide quicker. If he passes off J. Thomas and drops to Welker, but Manning is sitting in the pocket comfortably, he has an extra tick to see Thomas coming open across the middle.
The Seattle defense works because everyone is, as their players themselves admit, tied together.