It looks like - subject to minor items - the B1G and SEC have exclusive control in terms of deciding the format of the CFP (including the CFP committee) beginning in 2026. To that end, it seems increasingly likely that the B1G and SEC will automatically have an unequal amount of bids vs the rest of the P4.
https://sports.yahoo.com/sources-sec-big-ten-building-momentum-to-further-expand-college-football-playoff-to-14-or-16-teams-235759195.html
https://sports.yahoo.com/sources-sec-big-ten-building-momentum-to-further-expand-college-football-playoff-to-14-or-16-teams-235759195.html