I answered your original post before seeing your follow up where you listed those 2 and others who have done it.
I couldn't really think of all of them off the top of my head, but when you cobble that list together, you have three guys who have won National Championships. Then you have Harbaugh, an entity unto himself. Then there is Fleck.
Harbaugh's first job was San Diego. FCS.
Dabo was interim and got the big seat at Clemson.
Orgeron was interim at SC, became interim at LSU and got the big seat at LSU.
Meyer got the BGSU job because they were a mess and no one else wanted it. Lou Holtz flat out told him so. BGSU took a shot and it paid off.
Fleck got WMU in similar fashion. That program was trash and they took a shot. It paid off.
Hartline's path might not be like any of these. Maybe somebody in Power Five just hands him the keys, but that isn't quite the norm. Then again we're not in normal times.
Back to the game. When you look at this ND defense to this point, I think they have enough to slow down Ohio State this year. If CJ Stroud or Justin Fields were QB, I'd feel different, but it's at home and I think they can do enough to limit the ground game and disrupt McCord. But I'm taking the over.