Chiefs went zone against them this past Sunday, and Manning shredded them.
I thought KC played a lot of man and it was actually working OK until Demaryius destroyed their rookie CB. There's logic to playing man under. Originally I thought man would be the way to go against Denver, but seeing how much of their damage is done on pick plays and running guys off one another, it seems too dangerous to play man. And without the healthy bodies in our DB, it seems like suicide. I agree with AndyJohnson's take.
I'll echo AJ's plan, I think he's spot on - zone, flood the middle, dare Manning to beat you deep. Meaning McCourty as the lone deep safety, IMO. Let Gregory &/or Harmon come up and play that robber coverage. It's the middle of the field with crossing routes, slants, pick plays, and the like that Denver is killing right now.
I'd again stress having your pass rushers get their hands up and in passing lanes. I'd have Jones and Ninko line up real outside in the hopes they can snag a pick off of one of Manning's quick tosses. Have them ready for that quick throw. I'd even have them drop into short zones to take away slants a few times - we saw KC do this down in the red zone and a guy came close to a pick (turned into a Julius Thomas TD, but it could've been 6 the other way).
Basically, I'd almost concede pass rush at the expense of getting guys in coverage, and specifically into coverage in the shallow areas. Hightower, Ninko, these guys are going to have opportunities to make plays.
No one gets to Manning, he gets rid of it too quick and that OL is too solid, why bother? Sacks will come only when the play breaks down or late in the game when the OL tires.
Yesterday I thought Denver would put up 50 on us given our health situation. But the more I think about it, the more I realize that Peyton Manning - as great as he is - has limitations, and that no team has tried earnestly to exploit that until KC. Belichick will not be a knucklehead about it either. He'll put the guys in the best position to compete.