They don't need to. They also don't spend a lot of time "chasing down receivers." They play press coverage a lot, with Thomas as a single high safety. He's fast enough to play sideline to sideline. WRs have a struggle just to get past the 5 yard cushion. Seattle also doesn't allow a lot of yards after catch. They hit hard and tackle well.
Seattle's LB's are very fast, and they have the best defense against screens and outlet passes to RBs in the league.
Seattle has several guys that can get to the QB, from the inside or the outside. They might not 'get' to Manning, but they'll get close enough for him to know they're there.
The real question is: Can Peyton score more against Seattle's defense than Wilson and Lynch can against Denver's?
I think so.
Oh, and Percy Harvin has been cleared to play. 
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