Best thing going forward for the BIG XII is to have 2 dominant teams, 6-8 really good teams, and the rest be at least
decent teams.
Win the vast majority of the crossover P4 games, don't drop any G6 games (especially to not great teams), and don't beat each other up in conference.
Do that and they'll routinely get 2 teams in. Don't rely on one trip up in the inaugural season to try to set up things for future seasons.