What was Charleston's only weakness as a player as noted in the biography, Oscar Charleston: Was Cobb “The White Charleston”?

Charleston had only one significant weakness as a player; despite his powerful build everyone who played with or against him said that he had a weak throwing arm. Since even the fenced outfields of the time tended to be huge and the Latin American ball parks often had no outfield fences at all, this presented the weak-throwing Charleston with a dilemma. Should he play way back to prevent batted balls from going over his head or play close to the infield where most balls would land, leaving him a short distance to throw? Charleston chose to play close to the infield, counting on his speed to allow him to catch up to balls hit over his head. A little past the midpoint of his long career when he had slowed somewhat, he switched from centerfield to first base, where his quick reaction time was an asset and his weak throwing did minimal harm.