Questions after Seattle Game

Lawson is fast enough to cover receivers and has the strength to crush running backs, so I don't understand why they don't use him as a DBs in their nickel package. If they insist on using a five DB package all game long, why keep Lawson, one of our best athletes, out of the game if he's healthy?).

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Nolan decided that since the Seahawks change formations so quickly, it was best to avoid using many substitutions. By sticking with nickel defense, he shut down the passing game, while allowing Seattle to easily run the ball on us. Analysts are baffled by Nolan's strategy. But I still wonder: would we have still won the game if we went with our usual strategy of constantly substituting players?