It really is tough to make bold predictions with this team because there are 3 big unknowns:
1. Can Day be the type of manager of a program that Urban was? The continued success in recruiting is a good sign that he has the same discipline and structure Urban had. Now he has to prove he can do the same in game prep and making the tough in-game decisions expected of a top coach. We know he can lead an offense.
2. What will the offense look like with Fields at the helm? It's a lot to ask for Fields to be the type of passer Haskins was. There's a chance we see a bit of a hybrid between what we got with Haskins and what JT was before that. In a perfect world Fields is a better passer than JT while being the dual threat that Haskins wasn't. Deshaun Watson has always been the high end comp for Fields so that's the best case scenario. Fields ran for 266 yards and 4 tds in very limited time last season so he's going to be a bit different than Haskins.
3. Did Day make the right hires on D? OSU was always known for having a stout D. Things started to sag at times in 2017 and then became downright erratic last season. I can't imagine things getting much worse than 2018 for the D, but going undefeated would likely mean the D returns to what it was prior to the last two seasons.
I think a case can be made the Buckeyes can go undefeated but if they do it will because those three questions were answered positively. For me they are important enough questions that I probably wouldn't make that bold of a prediction. I'm optimistic for the season though.