(For all Inside Slant posts, follow this link.)

Conspiracy theorists are circling the San Francisco 49ers, who were stunned Friday by their fourth retirement of the offseason. Right tackle Anthony Davis said he wanted to let his "brain and body heal," adding to a list of departures that also includes defensive lineman Justin Smith, linebacker Patrick Willis and linebacker Chris Borland.

It might be some time before we fully understand why so many key players have abandoned this franchise. (Yes, "coincidence" is among the likeliest explanations.) But as NFL teams move toward the obligatory part of their offseason programs -- five have mandatory minicamps this week -- it's worth putting the 49ers' exodus in perspective. Veteran players come and go from rosters each year, but based on one measure, no team has absorbed a greater net loss of personnel than the team that started it all off by parting ways with coach Jim Harbaugh in December.

NFL Offseason Turnover By Snaps Teams Total Added Total Loss Net 49ers 3,031 8,728 -5,697 Eagles 3,154 8,007 -4,853 Saints 3,150 7,421 -4,271 Steelers 232 3,749 -3,517 Dolphins 5,214 8,722 -3,508 Packers 0 3,442 -3,442 Rams 1,641 5,060 -3,419 Broncos 4,343 7,474 -3,131 Cardinals 3,458 6,560 -3,102 Giants 3,115 6,170 -3,055 Ravens 1,687 4,732 -3,045 Chiefs 3,450 6,279 -2,829 Chargers 4,316 6,711 -2,395 Texans 5,388 7,726 -2,338 Lions 3,963 6,211 -2,248 Falcons 4,320 6,542 -2,222 Redskins 3,973 6,109 -2,136 Browns 4,214 6,289 -2,075 Bills 3,054 4,835 -1,781 Buccaneers 3,858 5,444 -1,586 Cowboys 3,075 4,441 -1,366 Seahawks 2,810 4,008 -1,198 Titans 5,283 6,251 -968 Colts 5,301 5,997 -696 Vikings 2,787 3,439 -652 Patriots 4,992 5,614 -622 Bengals 2,247 2,672 -425 Jaguars 4,579 4,860 -281 Panthers 3,032 2,851 181 Raiders 6,179 5,467 712 Bears 6,328 5,566 762 Jets 8,055 4,080 3,975 Source: ESPN Stats & Information

The chart in this post is derived from a database of 2014 offensive and defensive snaps assembled by Henry Gargiulo of ESPN Stats & Information. Rather than simply providing a number of players signed or lost, it helps illustrate the impact of the transaction based on how often they played last season. You'll see that Davis' departure has pushed the 49ers ahead of the Miami Dolphins for the highest total of lost snaps.

But the final column of the chart offers better context. When you take the difference between snaps lost and snaps added -- a measure of what's left on the roster -- you find the 49ers atop the list with 5,697 net snaps lost. The Philadelphia Eagles are next (4,853), followed by the New Orleans Saints (4,271). No other team has more than 3,500 net snaps lost.

In addition to the four retirements, the 49ers allowed nearly a half-dozen veterans to depart via free agency: guard Mike Iupati, cornerbacks Chris Culliver and Perrish Cox, running back Frank Gore and linebacker Dan Skuta. Offensive lineman Jonathan Martin and receiver Stevie Johnson were released.

(The 49ers did acquire free-agent receiver Torrey Smith and defensive lineman Darnell Dockett, among others, but their arrivals only partially mitigated the 49ers' net losses.)

While we're at it, let's pull a few other notable nuggets from Gargiulo's database: