49ers declared RB Brandon Jacobs, RB LaMichael James, WR A.J. Jenkins, NT Ian Williams, QB Scott Tolzien, OG Joe Looney and S Trent Robinson inactive for Week 5 versus the Bills. Jacobs declared his knee 100 percent healthy, but the 49ers are giving him another week to shake the cobwebs loose. Frank Gore owners won't have to worry about Jacobs vulturing scores against the Bills' shaky run defense.