What’s the 49ers’ Plan B at RB?

Consider this a companion piece to this story, which raised questions about Carlos Hyde's ability to handle the heavy workload Chip Kelly has sought from his top running back. [...] the 49ers have five backup running backs, none of whom have more than 527 career rushing yards. The quintet includes two recent draft picks (Mike Davis, Kelvin Taylor), two journeymen (Shaun Draughn, DuJuan Harris) and a football novice (Jarryd Hayne). [...] they might enter training camp believing one of the backups will emerge as Hyde's clear-cut caddy. Here's a look at the pro-and-con arguments for the five reserve running backs: The case for: A 2015 fourth-round pick, Davis didn't have many opportunities as a rookie, partly because he missed seven games with a broken hand. When he did get on the field, he was running behind a shaky front five whose struggles inspired the 49ers to spend three of its first seven draft picks on offensive linemen. In his final two seasons in the SEC, he rushed 2,165 yards (5.4 yards a carry) and had 66 receptions (10.9). Last year, Davis became the sixth running back since 1970 to average less than 2.0 yards a carry with at least 35 carries in a season. Davis could...