McCovey also got to platoon significantly which raised his rates, though not from '68-'70. I would not say '69 is an extreme outlier when he went 174, 209, 182 over three consecutive full seasons and had 4 more years over 160.
The best estimate based on actual number of black players added and the average level of production is that the simple act of full integration would cut OPS+ scores by 4 or 5 percent, so Mccovey's 147 would be about 6-7 points higher if we removed all of the players who would have been banned, but he also got to play through expansion periods so 6-7 points is the maximum boost to about 154. If the average player produced the same relative isolated power and walks during Gehrig's time as they did after full integration, Gehrig's OPS+ would have been cut by about 15-16 points to 163 or 164. I think this is a little too much of a deduction because players in Gehrig's time produced more of their value from batting average anyway, so about half of this, or 7-8 points may be right, and its in the ballpark of the 6-7 point integration estimate. Gehrig 172 to McCovey 147 or Gehrig 179 to McCovey 154 sounds about right on equal settings, but 179 to 147 is not really twice as much better than the league anyway. Its only 168% as much better.
Foxx was real burner. He is recorded as posting a personal best of 8.6 seconds in the 80-yard dash at the age of 14. A year later, he was clocked at 10.6 secs. in the 100-yard and 23 secs. in the 220-yard. (At an undetermined date, he is alleged to have been clocked at 10 seconds flat in the 100-yard.) Bill Werber, often claimed as the fastest ballplayer in his day (he once stole seven bases in a single minor league game), tells the story of how he once lined up to race against other baseball speedsters of his day, such as Ben Chapman, Jake Powell, and Meryl Hoag, only to have Foxx beat them all.
A swing--and a smash--and a gray streak partaking/Of ghostly manoeuvres that follow the whack;/The old earth rebounds with a quiver and quaking/And high flies the dust as he thuds on the track;/The atmosphere reels--and it isn't the comet--/There follows the blur of a phantom at play;/Then out from the reel comes the glitter of steel--/And damned be the fellow that gets in the way. A swing and a smash--and the far echoes quiver--/A ripping and rearing and volcanic roar;/And off streaks the Ghost with a shake and a shiver,/To hurdle red hell on the way to a score;/A cross between tidal wave, cyclone and earthquake--/Fire, wind and water all out on a lark;/Then out from the reel comes the glitter of steel,/Plus ten tons of dynamite hitched to a spark.
--Cobb, Grantland Rice
"I go all out, and I'm going to bring that to the table everyday. In good times and in bad times." - Eric Byrnes
"There are more things in heaven and earth, Horatio, Than are dreamt of in your philosophy."
"Walks are the orphan child of the dope sheets." - F.C. Lane