The Buffalo Bills have run through more defensive coordinators over the past four years than any other team in the NFL, complicating their player-acquisition process through both free agency and the draft.
While their defensive schemes have changed each offseason since 2011, it's not all bad news. In hiring Mike Pettine last winter and Jim Schwartz to replace him in January, the Bills are sacrificing long-term coaching stability to help win now.
It's the right approach. Schwartz has extensive experience as a coordinator and head coach, while Pettine is a riser in the NFL coaching ranks, having recently been hired to lead the Browns. They're both talented defensive minds and better than the alternative, which would have been to promote from within or to poach an up-and-coming position coach from another team.
Schwartz is already putting his mark on the Bills defense. General manager Doug Whaley revealed last week that Kiko Alonso, who finished second in voting for the Associated Press' Defensive Rookie of the Year award, will move to weakside linebacker as part of yet another defensive overhaul.
Replacing Alonso at middle linebacker will be newly signed Brandon Spikes. The Bills also signed Keith Rivers, a former first-round draft pick, to potentially start at strongside linebacker.
It will be a whole new look, but one that presents some challenges for the Bills.
It was only a year ago when Buffalo signed linebacker Manny Lawson to a four-year, $12 million deal. The lanky veteran proved a strong fit in Pettine's system, starting 15 games and posting his best statistical marks since 2009.
Now Lawson is a man without a home. Under Pettine, Lawson could play close to the line of scrimmage, setting the edge against the run and blitzing on occasion. Things will be different with Schwartz, who rarely blitzes his linebackers and requires sturdier defensive ends than the 240-pound Lawson.
The Bills' defense improved in a number of areas during Mike Pettine's lone season as coordinator.
With three years left on Lawson's contract, the Bills wouldn't have received much of a salary-cap benefit by releasing him. Instead, they paid Lawson his $500,000 roster bonus last week and will try to find him a place among their new furniture.
"I think he's going to be a hybrid player. He's going to be able to bring us something as an outside linebacker but also come off the edge as a defensive end," Whaley told WGR 550 last week. "His versatility is going to be utilized within this system. That we think is going to be very valuable for us."
Translation: We like you Manny, but we don't really know what to do with you.
Lawson might find a situational role at defensive end, where Mario Williams and Jerry Hughes are the top two options. It also could be a position where the Bills try to add depth in the draft.
What about Alan Branch, who started 13 games at defensive end last season? Pettine's system required three big bodies along the defensive line. At 325 pounds, Branch fit that bill.
Without waiting to see how things would unfold with Pettine, the Bills jumped the gun in late December and gave Branch a three-year extension worth more than $3 million per season, with nearly $4 million in guaranteed money.
Under Schwartz, Branch figures to have a lesser role. The Bills already have a pair of defensive tackles in Kyle Williams and Marcell Dareus -- who both made the Pro Bowl last season -- and Branch will be a capable but likely overpaid backup.
The Bills were smarter in doling out contracts last week. Spikes received a one-year deal and Rivers signed for two years. Both contracts included little guaranteed money.
After all, who knows where Schwartz will be by next January?
It took Schwartz eight seasons as the Tennessee Titans' defensive coordinator to earn his first head-coaching job, with the Detroit Lions. He's known as a prideful coach who, when introduced in Buffalo, came off miffed about the way things ended after five seasons in Detroit.
"I think if you look around, just about every coach has been in that position. Every coach has had some situation," he said. "There are some great ones that have been fired."
At 47, Schwartz might not have to wait long for another head-coaching opportunity, but that doesn't make him a bad investment by the Bills.
The Bills gambled when they hired Pettine last winter. It was among the NFL's worst-kept secrets that Pettine wanted to become a head coach. He was on the fast track. Unusual circumstances may have led to his hire by the Browns, but the departure from Buffalo was inevitable.
Likewise with Schwartz. The Bills might rebuild and grow with Whaley, Doug Marrone and EJ Manuel, but it's unlikely that Schwartz will stick around long enough to see that process through.
In Pettine and Schwartz, the Bills hired the best options on the market. Pettine boosted several areas of the Bills defense, helping it improve from 22nd in yards allowed per game in 2012 to 10th in 2013, while seeing the red zone defense jump from 31st to sixth last season. The Bills finished second in opposing QBR, second in sacks, second in interceptions and first in opposing completion percentage.
Meanwhile, Schwartz's defenses were typically strong in Tennessee, especially against the run. The Titans finished in the top six in rushing yards allowed in five of Schwartz's eight seasons as defensive coordinator.
Most important, both coaches are confident and experienced, allowing Marrone to focus his attention where it's needed the most: on offense. Had the Bills turned to a younger, less experienced defensive coordinator than Pettine or Schwartz, it would have created more continuity with scheme but also would have stretched Marrone thin.
Whaley and his scouting staff might get headaches trying to keep up with the defensive changes, but for a city that desperately needs a winning team, this is the right way to go.