I'm surprised that anyone is surprised by this. Going back to 2000, how many times have we not been a 1 qb team? Zac Lee was a capable backup for TMart, but that's about it. Keller had Ganz, but quite honestly it should have been the other way around and I wouldnt have called Keller a capable backup.
We went from 2013 to 2017 without having a single HS quarterback recruit become a starter. This is nothing new.