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I'd be willing to bet against that and, as @OrangeAfroMan says:Notre Dame's schedule is closer to Cincy's than it is to OU/OkSU, it would be ridiculously gross:

The above uses rankings from CBS.  Note also that I have assumed that each will make their CG (because if they don't we don't care) and I've taken an educated guess at their CG opponent wherever it isn't already known. 

A CG would REALLY help ND here.  If they were IN the ACC and won a division they'd be adding #17 Pitt, #21 Wake, #23 NCST, or #26 Clemson.  All of those fall between their second (#15 UW) and third (#33 PU) best opponents so it would knock #3-#12 each down a rung which would make ND's schedule much more comparable to OkSU/OU/tOSU/Bama. 

Both ND and Cincy's top two opponents are comparable to the rest.  The weakness of their schedules is at #3 and below, particularly #3-#8 where their third, fourth, etc best opponents are substantially worse than OkSU, OU, tOSU, and Bama:

• #3 for OkSU/OU/tOSU/Bama is 8-18:  For ND and Cincy it is #33 and #30
• #4 for OkSU/OU/tOSU/Bama is 15-35:  For ND and Cincy it is #48 and #59
• #5 for OkSU/OU/tOSU/Bama is 27-39:  For ND and Cincy it is #49 and #64
• #6 for OkSU/OU/tOSU/Bama is 33-56:  For ND and Cincy it is #65 and #83
• #7 for OkSU/OU/tOSU/Bama is 43-60:  For ND and Cincy it is #74 and #90
• #8 for OkSU/OU/tOSU/Bama is 46-68:  For ND and Cincy it is #79 and #99

By the time we get down to #9 and below they are all playing crap opponents so it probably doesn't make any difference.  Still, ND and Cincy trail the others at both #9 and #10. 

First point:
You are cherry picking here with "single digits" and I would strongly argue that the difference between 8 and 9 is a LOT bigger than the difference between 9 and 10 because 8 is potentially a one-score game while 9 and 10 are both two score games. 

Second point:
Again for the millionth time, Ohio State played a VASTLY better schedule so it isn't unreasonable to assume that Ohio State should have more close games EVEN IF the teams were equal. 

Using your ridiculous cherry-picked distinction, Ohio State has "single-digit" wins over:

• #29 PSU (by 9 points which is two scores)
• #68 UNL (again by 9 points which is two scores)

Then the Buckeyes have a single digit loss to #13 Oregon which was by a TD (ie, one score). 

What about Cincy, they have "single digit" wins over:

• #90 Tulsa (by 8 which is one score and Tulsa had the ball at the Cincy 1 yard line with under a minute to play)
• #99 Navy (by 7 which is one score)

Even using your framing, Cincy's two "single digit" wins are VASTLY worse than tOSU's two "single digit" wins because tOSU's came against VASTLY better teams. 

My left nut would be dominant in most of Cincinnati's games.