The reunion with quarterback Alex Smith is the big story line for the Chiefs’ visit Sunday, but the 49ers will be reconnecting with another former first-round pick they have traded to Kansas City: wide receiver A.J. Jenkins. In his 20 games with Kansas City, he has 12 catches for 146 yards and no touchdowns. Baldwin, another disappointing former first-round pick, is a free agent after he had three catches for 28 yards last year. Safety Antoine Bethea was named the NFC Defensive Player of the Week after he had seven tackles, a forced fumble and an interception to lead a suffocating defensive effort in a 26-21 win over the Eagles. The nine-year veteran also helped keep Philadelphia’s offense scoreless with his knowledge of their high-octane, no-huddle attack. Defensive tackle Demarcus Dobbs drilled running back LeSean McCoy for a 4-yard loss on a sweep left.