You only need 1 single match to synchronize the players, as the upcoming scenario, depend of the last match ratings achieved by the players that you're going to use.
Simply-
League Match 1- league match 2-Finale
To try to achieve a rating increase in the Finale, you need to play with the 11 coming from a rating droping.
In league match 2 then, you will use those who have 8+ to try to force a rating decreasing, and you'll bench those who already got a 5,6 or, a 7 after a 7+ in the League match 1.