RRosternomics
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DJ

Dan Jennings

Born Sep 16, 1960 · Daphne, AL · age 65

General manager for the Marlins (2014–2015).

2 seasons with salary-era data across 1 stint. All figures are franchise-level outcomes during the tenure, not solely attributable to one executive.

Overview

Titles0
Pennants0
Playoffs0
Record148–176
Win %0.457
+1.9GM WAR — wins above a replacement GM (org-adjusted, shrunk; per season) ±7.136th/195 execs
6.0Depth — 2+ WAR regulars per season (the breadth that drives TAB, not stars)102nd/195 execs
-5.3Dead WAR — WAR/yr bled by sub-replacement players (closer to 0 = better)109th/195 execs
51%Dead money — payroll on <0.5-WAR players (lower = better)182nd/195 execs
$59MCheap-talent surplus — $/yr of value from cost-controlled (pre-arb/arb) players above their pay; the selection engine, and the stickiest GM skill we track11th/195 execs
$31MDrafted surplus — cheap-talent surplus from his own draftees (the develop-from-the-draft engine)3rd/195 execs
$20MTraded-for surplus — cheap-talent surplus from cost-controlled players he acquired via trade14th/195 execs
$8MInt'l surplus — cheap-talent surplus from his own international signees6th/195 execs
+10.5TAB — talent above budget — roster-construction alpha (talent your budget bought above expectation), tenure total50th/195 execs
+3.4WAB — realized wins (TAB + the non-repeatable luck of converting talent to wins)60th/195 execs
0.63Acquisition Leverage — playoff pts per acquired WAR, graded once in the year each deal's wins arrive (the repeatable decision skill)141st/195 execs
+73Roster surplus $M16th/195 execs

Tenure breakdown

TeamRoleYearsSzns WAB WAB/yr TAB WAR surp HG Trade FA R5 AcqLev W-L% POPenWS Surp $M
▸ Marlins GM 2014–2015 2 +3.4 +1.71 +10.5 +24.3 +11.8 -21.6 -5.6 +0.0 0.63 0.457 ––– +73
Career total (1985+ data) 2 +3.4 +10.5 +24.3 +11.8 -21.6 -5.6 +0.0 0.63 0.457 –– – +73

Roster Construction

How the roster was sourced

by valueby volume

Share of acquired fWAR by channel vs. league average.

Build channels — net fWAR

Acquired minus surrendered / signed minus walked.

Home-grown (draft/intl)+11.8
Trade-21.6
Free agency-5.6
Rule 5 / minor draft+0.0
Sourcing mix: 34% draft · 0% FA · 66% trade · 0% R5

Roster value distribution — career average — depth vs. stars

Every roster slot ranked best→worst by WAR, averaged across Dan Jennings's seasons. Bars = his rosters; the black line = the league-average player at each slot. Staying above the line deep into the roster is the depth edge.

Players acquired — 44 players, by realized fWAR for the franchise (scroll for more)

PlayerPosTeam How Year Szns fWAR WAR/yr Lev
Miguel Rojas SS MIA Trade 2014 8 +9.4 +1.2 0.2
Brian Anderson 3B/OF MIA Draft 2014 6 +8.7 +1.4 –
Dee Strange-Gordon 2B MIA Trade 2014 3 +8.1 +2.7 1.1
Martín Prado 3B MIA Trade 2015 3 +5.3 +1.8 0.8
Edward Cabrera P MIA Intl FA 2015 4 +3.8 +0.9 –
David Phelps P MIA Trade 2014 3 +3.2 +1.1 0.3
Adeiny Hechavarría SS MIA Trade 2014 4 +2.6 +0.7 0.7
Kyle Barraclough P MIA Trade 2015 3 +2.3 +0.8 –
Mat Latos P MIA Trade 2015 1 +1.8 +1.8 0.5
Carter Capps P MIA Trade 2014 2 +1.7 +0.8 0.5
Casey McGehee 3B MIA Trade 2014 1 +1.2 +1.2 2.9
Dan Haren P MIA Trade 2015 1 +1.0 +1.0 0.3
Jeff Mathis C MIA Free agency 2015 3 +0.6 +0.2 0.0
Ichiro Suzuki OF MIA Free agency 2015 1 +0.6 +0.6 5.5
Enrique Hernández OF MIA Trade 2014 1 +0.4 +0.4 0.6
Garrett Jones 1B/OF MIA Trade 2014 1 +0.3 +0.3 0.5
Bryan Morris P MIA Trade 2014 2 +0.3 +0.1 0.8
Kendry Flores P MIA Trade 2014 1 +0.2 +0.2 –
Sam Dyson P MIA Trade 2014 2 +0.2 +0.1 0.4
Cole Gillespie OF MIA Free agency 2014 1 +0.1 +0.1 0.1
Jordan Holloway P MIA Draft 2014 2 +0.1 +0.0 –
Vin Mazzaro P MIA Free agency 2015 1 +0.1 +0.1 0.0
Nick Masset P MIA Trade 2015 1 +0.1 +0.1 0.0
Jeff Brigham P MIA Trade 2015 2 -0.0 -0.0 –
Dillon Peters P MIA Draft 2014 1 -0.0 -0.0 –
Chris Reed P MIA Trade 2015 1 +0.0 +0.0 –
Randy Wolf P MIA Free agency 2014 – -0.0 – –
Jordany Valdespin 2B/OF MIA Trade 2014 1 +0.0 +0.0 0.2
Reid Brignac SS MIA Free agency 2014 – -0.1 – –
Erik Cordier P MIA Free agency 2015 – -0.1 – –
Don Kelly OF MIA Free agency 2015 – -0.1 – –
Cody Poteet P MIA Draft 2015 – -0.1 – –
Henry Rodríguez P MIA Free agency 2014 – -0.1 – –
Kevin Gregg P MIA Free agency 2014 2 -0.2 -0.1 0.4
Kyle Keller P MIA Draft 2015 – -0.2 – –
Xavier Scruggs 1B MIA Free agency 2015 – -0.2 – –
Jeff Baker 1B/2B MIA Free agency 2014 – -0.3 – –
Ben Meyer P MIA Draft 2015 – -0.3 – –
Jarred Cosart P MIA Trade 2014 2 -0.4 -0.2 1.9
Dustin McGowan P MIA Free agency 2015 – -0.4 – –
Jhonatan Solano C MIA Free agency 2014 – -0.4 – –
Reed Johnson OF MIA Free agency 2014 – -0.5 – –
Carlos Marmól P MIA Free agency 2014 – -0.5 – –
Chris Narveson P MIA Free agency 2014 – -0.7 – –

WAB = wins above what the team's payroll predicted (resource-controlled). WAR surplus = era-neutral value (WAR minus payroll in win-equivalents). Roster surplus $M = dollar value of WAR over cost. Build channels (realized fWAR): HG = home-grown via amateur draft / international signing; Trade = acquired minus surrendered (incl. purchases/waivers); FA = signed minus walked; R5 = Rule-5 / minor-league-draft pickups. Credit follows the acquisition year — home-grown to the regime at the player's draft/signing (not whoever was in the chair when he peaked), trade/FA/R5 to the GM who made the move. Players acquired as prospects before debuting (e.g. Smoltz, Bagwell; Rule-5 picks like Uggla) are counted as trade/R5, not home-grown. All are franchise-level outcomes during the stint, not solely attributable to one executive.

Graphs

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Rosternomics — quantifying front-office skill, attribution-clean. Follow @rosternomics on X. Decision-makers on record back to 1933; resource-controlled metrics (WAR & payroll) cover 1985–2026.
Data: FanGraphs (WAR), Baseball-Reference & the Chadwick Bureau register (rosters, IDs), the Lahman Database, Baseball America prospect rankings (via The Baseball Cube), and public payroll records. Transaction and trade data was obtained free of charge from and is copyrighted by Retrosheet. Executive birth/death data via Wikidata (CC0); bios are original. Emoji graphics by OpenMoji (CC BY-SA 4.0).
All figures are franchise-level outcomes credited to the decision-maker in the acquisition year — not solely attributable to one executive.