"It's never one person or even one sort of spot. A [defensive] lineman doesn't hold an edge and a linebacker misses fit, and then a safety misses a tackle. It's complex," said new defensive coordinator Matt Burke this offseason. "No one obviously wants to not have a good run defense. It's not something you go into a game saying. But it's hard to really pinpoint [the problem]. We're addressing a lot of issues, I think."