There's a scenario where Kyle Shanahan could believe that his system would work with any quarterback. Of course, Brock Purdy has proven that he can do everything Shanahan has asked of him, but that doesn't mean there isn't a chance Mac Jones could do the same.

Mac Jones and Brock Purdy had opposite experiences in the NFL. Jones was a first-round selection, joining arguably the most accomplished coach in NFL history.

Brock Purdy remains without a contract and things could turn ugly with the San Francisco 49ers if that doesn't change soon.