I don't think this is clear. Even great QB classes only have 2 or 3 elite prospects. The greatest QB class of the last 20 years was 2004. The Bills watched Eli Manning, Rivers, and Roesthlisberger go before they drafted. Then they decided to get the 4th best prospect in that class, JP Losman.
If the plan was to draft a QB in 2018 then why was Tyrod resigned? No, there is no plan. There is no hope in a better class in 2018 because there is no reason to believe the Bills will have a top 5 pick. We'll be picking 8,9, 10, or 11. It's how we roll.