And nor would a single-elimination tournament prove it, either. At least in baseball you play a series.
In football there is no other type of tournament that is practical. Even if you play best of seven, it doesn't guarantee that the better team will win, but asking for even a best-of-three series rather than single elimination will triple the number of games. Not possible in football, where you never play a game less than four days (usually seven) after the last one.