Here is a summary of the FiveThirtyEight Playoff chances

1) All favored (by %) teams win:
Clemson, OU, Auburn, OSU, Stanford win. OSU 53% in, Bama 38% in.

2) Same scenario as above but USC wins:
OSU 41%, USC, 30%, Bama 28%

3) Best case scenario for OSU:
Clemson, Auburn, OSU, TCU, and Stanford win. OSU 81%, Bama 57%. In this scenario OSU is in and Bama, TCU and Stanford fight for final spot. 

4) Best case scenario for Bama:
Clemson, Georgia, OSU, TCU, Stanford win. OSU 76%, Bama 59%, TCU 23%, Stanford 11%. 

5) Worst case scenario for OSU:
Wisky wins (ok this is in just for the lulz)

My prediction:
Most likely winners are the winners outlined in #2, mainly all favored win except USC beats Stanford. This brings OSU, Bama, and USC all very close for the final spot. According to the %, OSU and USC have better chance than Bama, and I don't see USC overtaking OSU based. 
 

https://projects.fivethirtyeight.com/2017-college-football-predictions/