What was the quality of pitching he faced?
That's the question mark. There were outstanding pitchers like Satchel Paige. Others?
The debate is whether Negro Leagues is considered to be Major League quality or Triple A. I’ll have to do more research.
The biggest difference in record comparison was Cobb (playing 15 years earlier) played during the “dead-ball” era when the ball was much less lively. The spit ball and dead ball era didn’t pass until sixteen years into Cobbs career. As his recent biographies prove this makes his accomplishments untouchable.