MLB teams that had the most transient talent in recent history

Among all players on a team's roster in a season (weighed by Win Shares), lowest average share of career Win Shares for the team in question, among all teams and World Series winners since 1990

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Win Shares are derived from WAR and are scaled so that 3 WS = 1 win.

Chart: Neil PaineSource: Baseball-Reference, FanGraphsCreated with Datawrapper