Which is, of course, two more than are playing at the major league level in the Japanese Leagues today... that is, if we buy that premise which I do not necessarily buy. Robinson and every other player who had been a solid veteran player in the Negro Leagues made a seamless move into the major leagues. Think of Satchell Paige, Monte Irvin, Larry Doby, Robinson himself. By the 1950's the Negro Leagues were not much more than a minor league.
There have been many longtime Negro League players who are among the best at their positions in the history of the game. I speak, most significantly, of Josh Gibson, Oscar Charleston and Paige (see above)..... and yet, there was no controversy about who the ROY should be at that time.