Spags had the benefit of a great Strahan, as well as a consistently great Osi and Tuck.
Not to mention, when it came to pressure:
Cofield > Canty
Robbins > Joseph
Basically, he had the benefit of a great defensive line that pressured the QB consistently.
When Fewell gets consistent pressure, ie the Jets game, his defense looks great too.
I don't care who the coordinator is, our defensive line will make them look great or like a goat.