The million dollar question is will Grier draft a qb in the first even if Rosen shows promise? He made it sound like the answer is yes
He said they’d do whatever they felt was best for the team. If a potential franchise QB is staring them in the face and it’s still unclear whether Rosen is one himself, it is certainly wise to still draft that QB then sort it out later.
The team needs a viable backup regardless. If whomever loses the QB battle looks promising enough, they can do what the Patriots did with Jimmy G a couple years ago and trade him.