I did a quick look at the players playing in the first half.
On defense, we know we went into the game without T. Crawford, O. Scandrick and we didn't start Thornton...so we really were down three players. We were in nickle a good bit of the time so Brown was in for Scandrick.
First two series we basically played our starting D and we gave up a FG.
Third series Mayowa, Church were not in and Lee left after second play. Russell, Brown, Wilcox were in and then Wilson took Lee's place. No points given up.
Fourth series, Jones went out, Church came back in. Wilson burnt Brown on the play where he got lost and then had the perfect throw to beat tough coverage by Claiborne. At best, we had 5, maybe 6 starters on the field at this point and Seattle still basically had entire starting group.
After half, the Seahawks again still had basically the whole starting unit in, the only starter Dallas had in was Hitchens.
I think the defense played pretty decently while they were in. Seattle used a lot of short passes which defeated pass rush. Our LB's and secondary did not tackle really well, giving up RAC on most plays.
On the other side, we of course didn't have Romo after 2 plays and no Dez.
Our 4th series, Tyron came out, Witten came out, Zeke went out so we in effect has 6 starters in against the majority of their starting D. Sherman, Thomas, etc were all out there. Seattle was playing 8 in the box a lot. They stacked the line many occasions and then dropped guys so only 4 were coming. I see them send 5 and 6 rushers on multiple occasions. They hardly played vanilla. The good news is that despite this Dak was not overwhelmed.