Problem is, this assumes his slider is already so good that it doesn't need any work in the pros, or at least that he can skip working on it in game situations at his first full season level. That seems like a pretty huge assumption, especially for a raw 18 year old HS quarterback. Maybe if he had previously demonstrated the skill, like Liriano or Meyer, I understand working on other offerings or protecting the arm. But at this point, it feels like counting chickens before they hatch. If I were a prospect evaluator, I would have to factor in the concern that his slider may not be that great/consistent/sustainable, which would take a big bite out of his projected value.