All good arguments.
But your winner is Jim Brown.
Unlike Bo or Deion, there is an argument that he the greatest football player who ever lived.
Unlike Bo or Deion, there is no question that Jim is one of the greatest of all time in his "other sport". Deion and Bo were good baseball players. Jim's other sport (Lacrosse)...well, they consider him to be one of the best lacrosse players of all time and the Premier league named their championship trophy after him.
Sorry - it's Jim Brown. The fact that he played lacrosse instead of baseball is the only reason folks don't talk about him more as the best dual sport athlete of all time, at least in America.