Like in soccer, American football zone defenses want to limit space between their lines to eliminate openings. Let's look at how the Colts & Bears defense ran the same coverages, nominally, but played out in complete different ways and then how the Bills & Saints beat it (1/2)

(2/2)
The Colts defense did a great job in the first half of not giving up any space between the lines and it forced Allen to make plays (which he did) out of structure. 2nd half just take the easy completion underneath.
The Saints had to find a different path:

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