I totally get what you're saying, and I'm usually one of those guys with a mindset of "anything can happen" when it comes to players and playing time.
I think it's a few things... the first being that Urban Meyer doesn't start true freshman unless he absolutely has to. Since his Florida days, I think he's had 3 true frosh start for him... Mike Pouncey, Joe Haden, and Michael Jordan last season. It just doesn't happen very often under Meyer, and if it does happen, it's due to lack of depth... the 2017 Buckeyes have one of the deepest DE depth charts I've ever seen. Bosa, Lewis, Hubbard, and Holmes would all likely start on 95% of teams in all of college football. Jonathan Cooper and Rashod Berry are very talented sophomores. You're talking about the strength of the team. And as much as the team has talked up Worley, Baker, and Booker, not to mention Harrison, who is Browning going to be starting over? Is it possible? I guess. Anything's possible. Likely? I don't see it. Alabama plays true freshmen in big roles occasionally (Calvin Ridley, Cam Robinson, Julio Jones, Amari Cooper), Ohio State traditionally hasn't. We all know how much of a monster Joey Bosa was, but he only started in 2013 because of Washington's injury. Was he ready to start? Yes. Was he starting originally despite that? No. There's a precedent.
Second is the position itself... it's often tough for frosh defensive lineman and offensive lineman to make much of an impact year one. There are a handful every year (Lawrence at Clemson and Oliver at Houston were elite as true freshmen) but it's not quite as plug and play as some other positions. It's a steep learning curve as far as dealing with the strength and physicality of grown men; some kids are ready, some aren't. And the mental aspect is hugely overlooked... look at how long it took 5 star, elite prospects like Curtis Grant and Etienne Sabino to figure things out mentally. Physically, they were fine probably day 1.
Anywhere but those two positions this season, I could MAYBE see it. But there would have to be a big lack of depth.