The Cover 3 Cloud defense has a cornerback playing the flat, while Cover 4 does not assign a cornerback to this area.
Cover 3 Cloud defense always has a cornerback playing the flat. In Cover 3 Cloud, one corner and two safeties cover deep thirds, freeing up the other corner to defend the flat area near the sideline. On the other hand, in Cover 4, all defensive backs drop into deep coverage, leaving no cornerback specifically assigned to cover the flat.
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