the chargers also had arguably the worst run defense in the NFL and even though ingram had a good year the chargers were still bad at getting to the QB overall.
that was with a relatively healthy DL all year long. the OL while not great either was severely banged up, they used 24 different OL combinations last year......think about that for just a second.
the DL needed upgraded far more than the OL and the chargers top guy in the draft just so happens to play DE. the chargers had one decent defensive lineman over the last couple years and it showed.
kendall reyas was a huge bust and the rest of their guys are back up quality at best outside of Corey Liuget.