Robinson stayed relatively healthy compared to the rest of the Chargers ' offensive line in 2015 .
PFF ranked Robinson 37th out of 39 qualified centers , so the team could potentially replicate -- or improve -- Robinson 's production at a lower cost .
Robinson stayed relatively healthy compared to the rest of the Chargers ' offensive line in 2015 , but PFF ranked him 37th out of 39 qualified centers , so the team could potentially replicate -- or improve -- his production at a lower cost .