I've just finished going through the all time rosters of every MLB team.
What I have also done, but not published, is use my cross comparative WAR metric to select the best single season for all the members of those rosters.
From that pool, best single seasons from the All Time rosters of every MLB team from the All Time 40 Man Rosters (the Astros are in the AL, Brewers in NL, for these purposes). Each team has to have a representative.
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Catchers
Johnny Bench (1972) Reds
Mike Piazza (1997) Dodgers
Buster Posey (1B) (2012) Giants
First Base
Albert Pujols (2009) Cardinals
Dick Allen (3B/LF) (1964) Phillies
Todd Helton (L) (2004) Rockies
Second Base
Rogers Hornsby (1924) Cardinals
Joe Morgan (L) (1975) Reds
Jackie Robinson (3B/1B/LF) (1951) Dodgers
Shortstop
Honus Wagner (1908) Pirates
Arky Vaughan (L) (1935) Pirates
Ernie Banks (1B) (1959) Cubs
Robin Yount (CF) (1982) Brewers
Third Base
Ron Santo (1967) Cubs
Mike Schmidt (1980) Phillies
Eddie Mathews (1959) Braves
Left Field
Barry Bonds (L) (2001) Giants
Stan Musial (L) (1B/RF/CF) (1948) Cardinals
Frank Robinson (1B/RF) (1962) Reds
Center Field
Willie Mays (1965) Giants
Duke Snider (L) (1953) Dodgers
Right Field
Sammy Sosa (2001) Cubs
Bryce Harper (L) (2015) Nationals
Hank Aaron (LF/CF) (1959) Braves
Mel Ott (3B) (L) (1938) Giants
Giancarlo Stanton (2017) Marlins
Pitching Staff
Christy Mathewson (1908) Giants
Dwight Gooden (1985) Mets
Steve Carlton (L) (1972) Phillies
Bob Gibson (1968) Cardinals
Grover Cleveland Alexander (1915) Phillies
Sandy Koufax (L) (1963) Dodgers
Tom Seaver (1971) Mets
John Clarkson (RF) (1889) Braves
Jacob DeGrom (2018) Mets
Greg Maddux (1995) Braves
Randy Johnson (L) (2001) DBacks
Craig Kimbrel (2012) Braves
Josh Hader (L) (2021) Brewers
Trevor Hoffman (1998) Padres
