"Wherever you go in the NFL, the biggest thing a coach has to know is that the players are the most important thing. It's players over scheme," Ryan said. "What the coaches have to do, if they're going to stay coaching, and I've been coaching for a while now ... you better be able to adapt your system to your players. If you can't do that, I don't think you're going to be there long."
Ryan has learned lesson that the hard way. He was fired after only two years as defensive coordinator of the Dallas Cowboys.
The team gave up an average of 312.5 yards per game in the first half of his last season. But they lost five starters and two important backups to injuries, while some of their other starters were playing hobbled.
By the last eight games, they were yielding 398 yards a contest.
"In Dallas, man, I had an entirely different defense. It was crazy. We had one of the best defenses in the league. Then it was devastated, it was just ravished with injuries," Ryan said. "We had guys playing off the street. It killed every statistical thing we had going for us. We were at the top of everything. It didn't finish that way during the last four weeks of the season."
The point was, Ryan explained, excuses mean nothing in the NFL. He didn't forget that lesson when he was hired by New Orleans.
"The thing I learned there is that nobody cares what you have out there. You better be able to adapt with what you have," he said. "And its a testament to our scouting staff that what we had last year, with the injuries, we have good players all over this roster. And that's something we didn't really have in Dallas. So when the injuries hit, we weren't devastated, we just kind of moved on."
For every injury the Saints had in 2013, Ryan figured out a way to combat it. Outside linebackers Victor Butler and Will Smith went down with knee injuries before the season began.
Defensive end Kenyon Coleman tore a pectoral muscle and never played a snap. Middle linebacker Jonathan Vilma (knee) played only one game, and cornerback Patrick Robinson (patella) went down in Week 2. Cornerback Jabari Greer suffered a horrific knee injury vs. the 49ers midway through the season.
So Ryan adapted. He and coach Sean Payton came up with the idea to play more three and four-safety sets.