I think a lack of discipline is a 50/50 issue. Players have to execute, but if discipline is not something position coaches are drilling into their brains in practice then that's a problem. That specific play also tells me there is a preparation issue with the players and position coaches. I'm not sure how often ATL is passing out of that Ace, but my hunch would be not often. House and Brice have to see Julio on a crossing route and understand they have outside containment. If they're not recognizing that balanced formation and expecting run then their film study was lacking. The DC expected run otherwise I doubt we see 3 DL and Martinez on the field.