The overall scheme of any D is to prevent points. So looking at the bigger picture, being up by enough that they only need to focus on preventing chunk plays and getting beat deep, they're going to be set up to be run on. That wasn't the issue. The missed tackles were the issue. There were guys all over those big runs but they either bounced off or had their arms run through. Hopefully that was a function of "riding the cushion" and not an issue of lacking ability. They've shown they can be a very solid tackling team so I'm guessing it's the former.