49ers’ Brock Purdy offers edge at QB vs all but NFL’s most elite passers

There may not be a more improbable quarterback story in NFL history than Brock Purdy’s. He was the 262nd and final selection of the 2022 draft — the player annually handed the Mr. Irrelevant label — and opened his rookie season buried behind Trey Lance and Jimmy Garoppolo. He was not drafted to save the…