By Joseph McBride The San Francisco 49ers front office has received a lot of deserved praise in recent seasons, with the trade for Christian McCaffrey and the decision to select Brock Purdy with the very last pick of the 2022 NFL Draft two of their greatest successes. The Niners knew what they were getting with McCaffrey, but even he has exceeded expectations since leaving the Carolina Panthers for San Francisco. The running back who has scored 25 touchdowns this season was named Offensive Player of the Year on Thursday, and was also in the running for NFL MVP. But franchise quarterback Purdy …