It’s better to celebrate the 49ers for being a team that has two quarterbacks capable of taking them to the postseason. Jones led the 49ers to win over a Rams team that should be among the best in the NFC and a legitimate contender to reach the Super Bowl. Shanahan and the 49ers likely erred in letting Purdy play last week in a 26-21 loss to Jacksonville. Jones is already 3-0 as the starter for a team that’s 4-1 and atop the NFC West. This is a Rams team that hung with Philadelphia last season in the playoffs and again in a 33-25 loss this season.