There's also the fact that the TE (yellow box) widens out and goes for the outside shoulder of his defender at the snap. (sbnation.com)
He barely touched the ball (18 in total), and spent the entire game separated from the build - up play, sitting on the last shoulder of the defender waiting for a through ball to latch on to. (justarsenal.com)
The easiest way to describe outside zone is the this... On the front side of the run, the offensive line and sometimes a tight end are trying to reach the outside shoulder of the defender, after the first two steps. (sbnation.com)