The Steelers defense took another step closer to the style of play that can make it a complete — and potentially elite — unit this season in a 24-21 win over the Vikings at Croke Park in Dublin, Ireland.

One stat that highlights its improvement is the 14 sacks through four games — which ties the Lions and Rams for the most in the NFL (the Broncos have 12 sacks and play the Bengals on Monday night). The Steelers’ defense has seen improvement in their pass rush each week after one sack against the Jets in Week 1, two sacks against the Seahawks in Week 2, five sacks against the Patriots in Week 3 and six sacks against the Vikings.

But the reason for that rise isn’t just that T.J. Watt, Cam Heyward and Nick Herbig have gotten better or woken up. What’s built their steady rise in pass rush pr

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