Does it matter?
People who think it "makes it okay" if he only bet in favor of, and never against, his team, apparently don't know very much about baseball.
Rose was the manager of a team and thus made their strategic decisions. If he had a bet on (in favor of) his team for Saturday's game, and not for Sunday's game, this raises the temptation to pull out all the stops winning Saturday's game (using up all the relievers, moving the #1 starting pitcher up a day..) at the possible expense of Sunday's game.
Keep the sleazebag out for life.