Four team divisions wouldn’t work in baseball. There would be under.500 teams making the playoffs. That can’t happen.
If they do it, 16-team leagues, close to a balanced schedule, 1 and 2 seeds get a bye, 3 hosts 6 and 4 hosts 5 in a best of 3. If the 6-seed is under .500, they don’t make the playoffs...3-seed gets a bye too.
Then best of 5’s until the World Series.
Only the World Series is best of 7.