I think it’s exacerbated by the fact that this offense utilizes the deep ball so often because Heupel is great at scheming wide open deep shots.
If Heupel stands pat on QBs in the portal, that tells me he thinks one of his QBs (likely Milton) can be the man next year. And it likely means that he thinks they’ll fix Milton’s issues. Honestly, from what I’ve seen, I think it’s a calmness (or lack of) thing. He’s shown he can make every throw. He’s looked great this year when he comes into blowouts and just relaxed and plays ball. He shows touch and accuracy in those moments. He’s reportedly great in practice. But when he starts, he seems jacked up and throws the ball 100 mph with no arc. I don’t know how you fix that, but Heupel is a QB guru and if he thinks he can, I trust him.