Brandon Jacobs back to running at "full bore"
Jacobs should see the field as soon as the coaching staff deems him physically ready to play, as they brought in the 6'4'' 260-pound bruiser to be their short yardage specialist. Surprisingly, the smashmouth 49ers were dead last in the league last year in converting third and short situations. On 3rd-and-1 and 3rd-and-2, they only converted for a first down 27.1% of the time. Jacobs, on the other hand, got a first down in 17 of 24 of those situations last year with the Giants.
Jacobs may also see action in the 49ers jumbo set, which features two extra linemen and 292-pound defensive lineman Will Tukuafu at fullback.
Jacobs has been up and down the past four seasons, with yards per carry averages of 5.0, 3.7, 5.6, and 3.8. His best years are far behind, back when he put up two straight thousand-yard rushing seasons in 2007 and 2008 - he even scored 15 touchdowns in 13 games in 2008. His career numbers are a bit more impressive than many would expect, as he's now racked up 56 career rushing touchdowns on 4.5 yards per carry.
His return to action in San Francisco will put a bit of a damper on Frank Gore's fantasy output. Jacobs will be taking most short yardage scoring situations away from Gore, along with the midfield third-and-short situations. In addition, the 49ers occasionally opt to use their aforementioned jumbo set between the 20's, which will be more off Gore's workload.
Gore becomes a low-end RB2/good flex option, while Jacobs is nothing more than a desperation play should you have no other options and are just praying he gets in the endzone.