How do you figure that? Probably talking a 60 game season followed by playoffs. So August-November versus August-October for those leagues. They do have more players which complicates it. The other leagues are also facing 2020-21 season with no fans almost for sure.
MLB isn't going to play only 60 games. July 4 is the latest they can start and have any credibility. Beyond that, and there's no point.