Looking at an object through a prism bends the light and distorts what you are seeing. Time is a prism, for instance; it obscures things. Like coaches performances.
In his breaking story on Pete Carmichael Jr. interviewing with the Bears, Mike Florio at ProFootballTalk.com throws in that Carmichael had success as New Orleans offensive coordinator, but with Drew Brees as his quarterback.
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Apply that same qualifier to some other, bigger-name coaches:
Want Jon Gruden? I would, as long as he brings with him Simeon Rice, Warren Sapp, John Lynch, Derrick Brooks and Ronde Barber all in their primes. Gruden, by the way, made the playoffs twice over his final six years (Lovie Smith was three times in nine season), losing both times in wild-card games. The Bucs were 18th in scoring their Super Bowl season and 24th in yardage (the Bears were 16th in scoring, 28th in yardage last year).
How about Bill Cowher? Definitely the one you want, as long as Ben Roethlisberger, James Harrison and Troy Polamalu get off the plane with him. And that was when he won his Super Bowl in his 14th season. He did win one conference championship, in his fourth year. Lovie Smith got one of those in his third year.