As of right now (week 4), 10 of the top 10 teams in the AP poll are undefeated. If I count correctly, 18 of the top 25 are undefeated. There are also teams outside the top 25 that are undefeated. The ACC currently has 6 (Louisville, Duke, FSU, Miami, Syracuse, UNC).
The Big12 has Kansas, Texas, and Oklahoma.
The B1G has 4 (OSU, Mich, Penn State, Maryland)
Conference USA has Liberty and Jax State (¯\_(ツ)_/¯ )
The Mountain West still has Air Force undefeated.
The Pac 12 has USC, Oregon, Utah, Washington, and Washington State undefeated.
The SEC has three undefeated teams — UGA, Kentucky, and Missouri — all in the East.
There are no undefeated independents or members of the AAC or MAC
The undefeated teams are the closest to controlling their own destiny. In a 12 team playoff, they would control their own destiny.
This can’t last—a lot of these teams have to play each other—but as of right now the B12, PAC12, and ACC have a shot at the CFP, the B1G has a shot at getting two teams in (again), and the SEC’s best bet is currently UGA. The SEC has never missed the CFP.
In the ACC, FSU has the best shot, but UNC and Miami are possibles. Even if Duke remained undefeated, there’s a chance they wouldn’t get selected.