Mt. Rushmore: Ruth, Gehrig, DiMaggio, Mantle. Giants come close.

Baseball players only, no pitchers.

Mt. Rushmore
Ghorseman, CC BY-SA 3.0, via Wikimedia Commons

Only data for that team counts.

There's no doubt about the big four of the New York Yankees. Three played only for the Yankees, all but Ruth.

The Giants are the only team that comes close. But only Mel Ott played only for the Giants. And the Giants moved from New York to San Francisco. You don't see Mt. Rushmore moving.

Click this link to view the data derived from stathead.com. Fields on the right were used to compute OPS+ for each group: using the proportion of the individual's PA applied to his OPS+. Then adding them up.

For combined seasons, Playing for NYY, in the regular season, requiring Home Runs >= 350 and Adjusted OPS+ >= 150, sorted by descending Adjusted OPS+.

https://stathead.com/tiny/mlNtR

That's it for the Yankees. I tried adjusting the parameters for other teams, including the Braves, Reds, Tigers, but none got close.

From my spreadsheet:

Rk	Player	OPS+	HR	From	To	Age
1	Babe Ruth	209	659	1920	1934	25-39
2	Lou Gehrig	179	493	1923	1939	20-36
3	Mickey Mantle	172	536	1951	1968	19-36
4	Joe DiMaggio	155	361	1936	1951	21-36
		180	2,049
Rk	Player	OPS+	HR	From	To	Age
1	Barry Bonds	199	586	1993	2007	28-42
2	Willie Mays	157	646	1951	1972	20-41
3	Mel Ott	155	511	1926	1947	17-38
4	Willie McCovey	150	469	1959	1980	21-42
		164	2,212
	Yanks-Giants	16	-163
Rk	Player	OPS+	HR	From	To	Age