Michael, Helfet, Pierre-Louis and Simon were all listed as out entering the game, so the fact that they are inactive shouldn't come as a surprise. Norwood is a surprise, since he was considered probable for Week 1.
Cooper Helfet will compete for a roster spot with the Seahawks. Keep an eye on his progress in training camp, but he has minimal Fantasy value if he makes the final roster. He is not worth drafting in the majority of leagues.