If going with a current player - Purdy. If going one in the past- Young.
I love the way you described it OP. I love Purdy, been a Niners fan since 1983, seen my fair share of good and bad QBs, I liked Purdy from the moment I saw him play. I think he resembles a smaller Young and a younger Montana. He was enormous potential, do I want to win a Superbowl this year, yes - but also know he looks like a winner, be it this year or next or next, we’ll see. I glad we are in this present but look forward to the future with Brock as well.
Love it!!