Analysis: Christian McCaffrey is back. Now the 49ers have to protect him from himself

SANTA CLARA — It wasn’t much as practices go, but Monday’s session was enough to get the 49ers excited for what is to come with running back Christian McCaffrey.

Left tackle Trent Williams felt energized at the presence of “two-three,” referring to last year’s top offensive player by number. Quarterback Brock Purdy, in an informal chat with a few reporters, split into a wide smile as he described reaching for a handoff to the turbo-charged McCaffrey.

With the media window being less than five minutes during warmups...