"And the smallest staff in the league? New England has 12 assistants. Maybe Belichick knows something. His staff is shrinking. In February 2005, he won his third Super Bowl with 14 assistants."
Obviously, coaching is an area where a team should try to get any edge it can, since it's not subject to the cap. But the article makes a great point -- more isn't necessarily better. More scouts, trainers, video analysts, etc. is an advantage, but too many coaches may just get in the way.