I hope swiss stage + single-elimination bracket.
BO3 only for games that decide who advances to the playoffs or is eliminated from the tournament.All playoff games are BO5.
A run from the lower bracket in a double-elimination would be interesting, but not appropriate for a championship, a tournament that determines the best team of the year. The undefeated team in the playoffs should win the Champions.
If it becomes single-elimination, that time period can be used for the previous stage.
I trust that anyone who watched the KRU-FNC or KRU-GMB at Champions 2021 will agree with me.