Mike Sando doesn't really add much subjective input - he just groups them by experience and winning percentage. I'll post some excerpts:
...daveSeparating GMs into categories based on longevity allows for cleaner comparisons. I’ve done that below for all 32 NFL GMs, stacking them by winning percentage within their four experience buckets, and offering commentary on their situations.
GMs In Place For 10 or More Drafts (.565)
The Minnesota Vikings’ Rick Spielman and the the Los Angeles Rams’ Les Snead are new to this group, which no longer features Thomas Dimitroff, fired by the Atlanta Falcons during last season. The top four in winning percentage have won Super Bowls. Two of the three with the lowest winning percentages enjoy incredible job security. They own their teams!
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GMs In Place For 5-9 Drafts (.492)
This group is down to eight from 10 after Snead and Spielman aged into the group with 10-plus drafts. Two others, Dave Caldwell and Bob Quinn, were fired. The Indianapolis Colts’ Chris Ballard and the San Francisco 49ers’ John Lynch are new to this group.
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2. Steve Keim, Arizona Cardinals (.540): The comfort level between GM and owner can be critical to longevity. Keim has that after more than two decades with the organization, helping him ride out rough patches and rebuild the team around quarterback Kyler Murray. The Cardinals had the NFL’s worst record in 2018. They currently own the league’s best mark at 9-2.
GMs In Place For 3-4 Drafts (.588)
This grouping features GMs from teams that include the last three MVPs in Brian Gutekunst (Aaron Rodgers), Brett Veach (Patrick Mahomes) and Eric DeCosta (Lamar Jackson). All three GMs were working for their teams when those MVPs were drafted, but not in their current roles. Other GMs in this bucket acquired their quarterbacks by draft, trade or free agency.
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GMs In Place For 1-2 Drafts (.373)
Only two of the nine GMs in this group have acquired quarterbacks for the long-term future (the Jaguars with Trevor Lawrence, and the Jets with Zach Wilson). The six first-year GMs have a combined 20-46-1 record.
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