In 2010, Perry Fewell could have become the defensive coordinator of the Bears or the Giants.
Despite being the Bears defensive backs coach in 2005, Fewell decided not to return to Chicago and instead headed to New Jersey.
"I love Lovie Smith and enjoyed my time in Chicago," he said, [but] I knew that was coach Smith's defense. He is an excellent defensive coach and I just thought that at the time, I probably needed to step out on my own and run my own defense.
"It was always going to be coach Smith's defense and if I was going to make my mark in coaching I had to do it Perry Fewell's way, and that was one of the main reasons I came to New York."
Still, Fewell said he considers Smith "like a brother," and the decision was still a hard one.
"Probably the most difficult decision I've had to make, because Lovie Smith means a whole lot to me," he said.
Specifically, Fewell said he learned how to deal with players and people under Smith.
"That experience is probably the best growth experience I've had in the National Football League, as far as how to handle tough situations and how to be a professional," Fewell said.