With all respect to Mr. Schumacher, I am in awags corner on this particular point especially if you run niche schemes (Wishbone, 4-4, etc). I have found that while the QB is important (not as much for running QB, IMO), having an OL, TE having high formation IQ is imperative. Obviously the team with the best horses will usually win, but in certain cases, having a slightly undermanned team with FIQ will push you over the top.
Just my two cents.
Tim