Honestly the plan really couldn't be much easier compared to previous games.
1) Find Nick Emmanwori. Run all your decoy **** at him, and don't throw at him.
2) Find Leonard Williams. He has a tell where he's shaded as to whether he's going to run a stunt or not. Campbell and Wilson HAVE TO HAVE TO HAVE TO figure out how to jam those stunts. They do that, Maye will have a big day.
3) Contain Smith-Njigba as best you can, probably by using match zones instead of pure man or pure zone. Keep those windows tight, make Darnold have to fit into really small spaces.
Do this, the pass rush will get home, that o-line is pretty damned mid, keep your lane integrity on the rush, because Seattle barely tries to run inside, all their success goes to the outside.
Stick with the run, even if the usual GDT suspects are crying that McDaniels is trying to run, you have a big size advantage on the right side of the line. Run gap stuff, limit the zone runs. Diggs needs to have a big slot day, there will be plenty of space, because Seattle runs like 70% split safety zone. Maye has to stay patient and take the easy money, let those corners creep up and then take your shots. Also take advantage when you do catch them in man, those corners both sorta suck in man coverage.
Seattle is a talented football team, very good, and pretty well-coached, but honestly I think we've played tougher teams in the playoffs. Seattle has not.