When facing zone defense, Bethel University (MN) OC Colin Duling teaches the Quarterback to manipulate the conflict defender. The responsibility to manipulate the non-conflict defender falls on the receivers.
In the video below, he describes a few scenarios, including a drill and how they practice the concept as a team. Coach Duling uses game film to show how they apply it.
The video is a portion of his Glazier Drive presentation, WR Technique & Drills vs. Zone Coverage.
Coverage Identification Teaching Points
Identifying Man vs Zone
Objective
Zone Coverage