That's pretty much what I've found as well, although the Seattle fans I've come across seem to feel that Dallas beat the injured Seattle, not the real Seattle, and the real Seattle will not lose at home to anyone twice, and certainly not the Cowboys.
If you get bored and want to get them riled up, ask them how long it's been since they faced a top 10 QB. Just so you know, it was October 12, and it was Tony Romo. During this 5-game win streak, they beat AZ back-ups twice, Kaepercan't, and Butt Fumble. Next, they play St Louis. In the divisional round of the playoffs, they'll either play AZ or a bad NFCS team. It's very possible that they don't face an excellent QB until the NFCCG. That would be over 3 months of beating average to bad QBs. Seattle is 2-2 against top 10 QBs this season, beating Rodgers and Manning, but not Rivers and Romo. BTW, the 2 QBs not scared to throw to Sherman's side? Rivers and Romo.