Because they have great O and great pass D.
But just look at what these two teams are doing on pass defense:
The Saints are No. 1 in Defensive Passer Rating (53.4); the Colts are No. 4 (68.1) The Saints are No. 1 in INTs (16); the Colts are No. 1 in pass TDs allowed (3) The Saints are No. 1 in completion percentage (51.3%); the Colts are No. 2 in passing YPA (5.54). The Saints are No. 1 in Passer Rating Differential (+54.28); the Colts are No. 2 in Passer Rating Differential (+42.8).
Imagine how good the Indy pass D would be if they actually had a healthy Jackson and Hayden.
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