Take a look at how Parcell's career numbers with Bill Belicheck by his side as an assistant compare with those when the "other Bill" was someplace else.
Bill + Bill 12 seasons, 117-73-1 (.616 pct) Two for three in Super Bowls, with four other playoff appearances.
Parcells alone 7 seasons 55-57-0 (.491 pct) Two playoff appearances - and zero victories.
Great injustice that the Bills played the Giants when they still had Belichek