INGLEWOOD, Calif. — So, perhaps we had it backward. Perhaps we should have expected the Miami Dolphins’ offensive line to play well in Sunday’s 36-34 victory over the Los Angeles Chargers, and should have expected the defensive front seven to be, well, sloppy. But that makes no sense. The Dolphins’ offensive line, which was shaky last season, was playing without Pro Bowl left tackle Terron Armstead, their best player.