SANTA CLARA (AP) — With newborn twins waiting at home and plenty of work to do on the field, NaVorro Bowman is feeling a great sense of responsibility this summer with the San Francisco 49ers. That comes with the territory after Bowman's emergence last year as one of the NFL's best linebackers in just his second season. Bowman went from a reserve role as a rookie to becoming a first-team All-Pro after the 49ers (No.