However , it 's Bowman who is the most productive player on the Niners ' hard - hitting defense .
LB NaVorro Bowman , San Francisco 49ers -- The 49ers have a lot of big - name talent on the defensive side , including Patrick Willis and Aldon Smith .
San Francisco 49ers 's LB who is the most productive LB on the San Francisco 49ers ' hard - hitting defense .
LB NaVorro Bowman , San Francisco 49ers -- The 49ers have a lot of big - name talent on the defensive side , including Patrick Willis and Aldon Smith .