This thread is kind of funny. Kam Chancellor literally netted the Seahawks wins when he came back and his not being there was noticed in the overall defense and even in ET, who makes his keys off of that communication (ET also had the shoulder as well, his down year was two full). Rather than getting back into cover 3 principles all over again, I'll just say that you might not like that Chancellor was right in his value to the team, but he was right none the less. I never liked the situation myself, but it is what it is. Even in the highlights below, which were lacking for last year, there were a couple where the lot of everyone who was watching said, "Game!"
[youtube]pYgs5lfL0zA[/youtube]
This is a dumb thread. Even if you narrowed down the cover 3 to spacial geometry you'd see that they're really equal parts in design. Slightly different, but equal parts none the less. In a cover 3, even you MLB has to be able to run his arse off in coverage and we have that. Reason being is that is will be only him and one other person (usually the SS, in our case) covering the short to middle zones. Unless you're running a cover 4, no other defense makes 2 defenders cover THAT much space in the middle of the field in pass coverge. Those players have to be really special. Your FS works in tandem with them depending on what they think they're looking at. If you REALLy wanted to talk about value to the overall structure of that defense then the MLB might have the single most difficult criteria in the defense. He's got to be able to take on OL on a regular basis and also get back and cover a ton of area in the cover 3 in the middle of the field.