The top 4 will probably only be favoured by referees if they are favoured by the audience.
Someone tried to find out why football teams win more at home than away. Their finding? The refereeing. But not voluntarily. Referees are influenced by the spectators. If you have a team play for empty stands, as happens occasionally as a punishment, the home advantage is lost. The also had referees refereeing matches where they heard the sounds from the audience, and then another group doing the same matches without the sound. No statistical uncertaintly about the find. The only question is "How much", not "If".
This was actually interesting, not every day you read something worthwhile on MTF.