Actually, I think its harder to game plan for guys you have no film on. I mean you can study guys and what they do on the field. Not saying it makes it easier, but.....not knowing an opponent can hurt you also. Im sure the Seahawks will put some points on the board, but probably just not as many as they would being healthy.
They have a good OL, they have a solid QB and they have decent RB's.....
Dont take anything for granted.