Seattle 's first team owned Denver 's in preseason, but neuther side was unleashing their full fury.
This isn't entirely true. Manning was 11/16/ for 163 yards, 1 TD and 0 int in 1 quarter plus one 2nd quarter drive. A receiver fumbled on a 20 yard catch. That's easily on pace for 400+ yards. But what's telling is that the the reserves slaughtered the Broncos. Down the stretch, depth will matter more. The Seahawks so far have been playing without many of their most talented defensive players, and without Harvin on the other side. The cavalry are coming, and in the meantime Seattle's backups are not only getting quality game experience, they have already made significant contributions to an incredible defensive unit. Seattle hasn't yet rolled out their playoff squad and they've been winning with an abbreviated team.
Carolina destroyed the Giants at home, in ways no team in the NFL would expect to do. The Seahawks beat them on the road. In their last 5 road games including playoffs, they are 4-1, out scoring opponents by 71 points (compare this to the 49ers who over the same stretch are 2-5 on the road, outscored by 70).
The Seahawks will be difficult to beat on the road. There are games they absolutely could lose on the road, but if they win half of those they still probably win home field advantage through the playoffs. If they lose 2 games at home it would be a shock. If they win home field advantage throughout the playoffs, they should be favored against any NFC team at Centurylink Field.
The Broncos, more than the Seahawks, must stay healthy, which makes their future a little less stable.
The team that can beat the Seahawks at home can pose a significant threat--I'm looking at you, Saints--but the Saints come to Seattle on a Monday night, which should make home field advantage a heavier burden for them to bear.