I'm not sure it will matter in the seeding. Clemson had ND/FSU. Iowa had a weak B10 schedule. Bama had a SEC schedule. And Oklahoma only beat B12 teams.
If I had to seed them based on "appearances", I'd probably have Bama, Oklahoma, Clemson, Iowa. My guess, if the CC play out the way one expects, you'll see Clemson, Bama, Oklahoma, MSU in that order.