There was a discussion on this topic back before the season, but I can't find the thread. Our OC calls it the zone read but our O-line coach calls it the zone. We are running the zone. O-line coaches don't care about sounding trendy, so he calls it what it is. The zone read is all the rage right now with high school qb's so our head coach and coordinators tell them that is what we run.
Those are two different schemes. The zone blocking scheme does not leave anyone unblocked. Every lineman has a responsibility to block the defender is their zone. The confusion with that is for young players they get confused on who to block and many times end up double teaming one guy and leaving one unblocked. complex blitzes make it hard for younger lineman to figure out who is their responsibility. (see Oklahoma film for a clinic in missed assignments from our line) The zone read leaves a man free from which the quarterback uses as his read key and decides if he should keep or hand off the ball. The theory there is that a defense is always going to try and have more people defending any given play than the offense can block based on how the linebackers respond to certain reads they make on the offensive lineman's blocks. By leaving one play side defender unblocked, you hope to have enough blockers for everyone else and there should be no way that the read defender can cover the interior run as well as the qb keeper. He has to pick one or the other. Sometimes that is the defensive end and sometimes it's a linebacker.
Since we don't actually run the zone read, the only way we can slow down the defense is with counters. We rarely run counters though. That's what puzzles me. We should also throw substantially more pop routes to the tight ends right behind the linebackers. that would help soften up the run defense more than anything. I look for us to do more of both of those going forward. If not, we have a problem with offensive coaching. I don't say that to sound like a know it all. It's just common play calling sense. It blows my mind that we don't do more of it.