After a flurry of activity involving quarterbacks, there was a big move on the defensive side of the ball yesterday. The Los Angeles Chargers acquired pass rusher Khalil Mack from the Bears, a move that makes sense for both sides. The rebuilding Bears need draft picks, the contending Chargers need another veteran pass rusher.

Mack is 31 years old and coming off a season where he played in only 7 games while battling injuries, but the three-time All-Pro (and former Defensive Player of the Year) still has elite ability. He had 6 sacks in those seven games last year, and at least 8.5 in each of his previous six seasons. Since 2015, only three defenders have more sacks -- Aaron Donald, Chandler Jones and Cameron Jordan. In addition, Mack has 29 more solo tackles over that timeframe than any of the league's other top pass rushers.

In the table, compiled using data from pro-football-reference, all players with at least 40 sacks over the past seven years are shown, sorted by solo tackles. New teammate Joey Bosa also shows up in the top half of the list.

40-SACK PLAYERS, 2015-PRESENT
PlayerGSkSoloAstCombTFLQBHits
Khalil Mack10172.52939839187124
Cameron Jordan11278.0264113377106156
Calais Campbell10750.026412238682140
Cameron Heyward10253.024914839778117
Aaron Donald11189.0247146393132213
DeForest Buckner9545.024314638958118
Von Miller9466.52387631482142
Chandler Jones9984.02376930691149
Shaquil Barrett10751.52368131764110
Jason Pierre-Paul9049.5230883185791
Melvin Ingram9945.02258230764108
T.J. Watt7772.02167829480150
Carlos Dunlap11060.521611132772155
Danielle Hunter8560.5216983147390
Brandon Graham9742.0216782947891
Joey Bosa7958.02137829173129
Matt Judon9347.02059129668128
Jadeveon Clowney9341.02058028583105
Fletcher Cox10945.52049830258116
DeMarcus Lawrence9648.520011231272100
Preston Smith11249.519710730456110
Justin Houston9053.5190602506698
Markus Golden9444.51849127555110
Bud Dupree9242.5182662485673
Everson Griffen9556.01778225962138
J.J. Watt7145.01777525274133
Olivier Vernon7942.01777725462119
Frank Clark10553.51556922459118
Whitney Mercilus9140.0153872405281
Ryan Kerrigan10857.5151582096895
Za'Darius Smith9144.51487922753112
Mario Addison10757.0145772225888
Robert Quinn9356.0145592045590
Yannick Ngakoue9555.51452817357119
Myles Garrett6858.51406320359116
Chris Jones9049.51386119948117
Geno Atkins8843.5124892135797

Chargers coach Brandon Staley was a defensive assistant with the Bears in 2018, Mack's first season with the team. He had 12.5 sacks in 14 games. That kind of potential would be welcome with the Chargers, who have long needed someone to pair with Bosa in that regard. Over the last three seasons, the Chargers have totaled just 92 sacks; only four teams have fewer over that time span. Los Angeles hasn't ranked higher than 20th in any of those years.

TEAM SACKS, 2019-PRESENT
Team192021Total
Pittsburgh545655165
LA Rams505350153
Tampa Bay474847142
New Orleans514546142
Washington464738131
Arizona404841129
San Francisco483048126
Buffalo443842124
Minnesota482351122
Green Bay414139121
Philadelphia434929121
Carolina532939121
Cleveland383843119
Denver404236118
Chicago323549116
Indianapolis414033114
Miami234148112
Dallas393141111
NY Giants364034110
Baltimore373934110
Kansas City453231108
Seattle284634108
New England472436107
Tennessee431943105
NY Jets35313399
Houston31343297
Jacksonville47183297
LA Chargers30273592
Cincinnati31174290
Las Vegas32213588
Detroit28243082
Atlanta28291875

Will the Chargers have a top-10 or 12 fantasy defense next year? That remains to be seen. Los Angeles hasn't ranked higher than 18th (1 point for sacks, 2 for takeaways) in five years, and Mack's previous team didn't rank higher than 15th in any of the last three. But it was 1st back in 2018, with Staley (as outside linebackers coach) and Mack together. A nice bump up into respectability should be coming.

--Andy Richardson