Felipe Alou used to be the same as Robinson. A fielder could make an error, or a baserunner make a mistake, or a hitter make an out in a key spot, and Alou wouldn't get too upset. But heaven help the pitcher (especially a reliever) who allowed a runner to score.
Josh Gibson the greatest hitter of all time? Maybe, but there's no way to know for sure, since he didn't play in MLB, and faced a wildly inconsistent level of competition. Gibson the best hitter in the history of the Negro Leagues I'll grant. Best all time? I don't see it.
Scot.