It is easy to get to 6 or 7. I can see a couple of reasons to bring in 8.
1. More teams means more stability.
2. Seems like it will be tough to pull other west schools for 2024, easier in 2025. So you add 8 AAC schools now, bonus if you can dissolve the AAC at the same time. But then you turn around in 2025 and add four more schools in the west and scheduling becomes much easier and much less expensive. For example, for football you schedule 7 games in your division (east or west). You get some cool cross country matchups, but not brutal. Then with the non-football sports you do the same and save a ton on travel fees.