I don't disagree that the main reason we lost Super Bowl 25 was due to being out coached, for the precise reasons you mentioned.
But I'm still stating a fact, the glaring weakness on the Bills defense during the Super Bowl years was our 270lbs NT. That's why the Giants, Redskins and Cowboys could run the ball down our throats. Their Olines had clear size advantages and we didn't have a space eating run stuffer on D.