I had to stop reading because:
"We don't have quantifiable data to support Bret's claim, but conceptually, it makes sense and lines up with what we observed,"
This is smoke and mirrors and nothing more. Here's the argument in a nutshell. We can't substitute so the same guys are staying out on the field play after play and getting tired and more subject to injury.
Bull....Shit
#1: The offensive players are all out there the same number of plays. They aren't substituting either.
#2: If you don't want your guys on the field so long, tell them to tackle the ball carrier before he makes a first down. It's kind of a basic fundamental technique taught by most football coaches. (Except some AU coaches) A HUNH offense does not call for some magical set of plays you can't defend. Stop the offense and you come off the field.
#C: I'm no X's and O's guru, but I don't care what Gus Malzahn or most any other corch who runs a version of this offense says. I truly believe the HUNH is designed as much as anything else to eventually get defensive players out of position or the wrong personnel on the field so you run into mismatches.
I'll say it again, despite what he says he wants to do, Malzahn's offense just isn't that fast. And I'm not talking about the year Chiz told him to slow it down. They do get back to the line quickly. THAT is the key. You have now accomplished what you set out to do IMO. The defense can't substitute for fear of a quick snap. But traditionally, Auburn hits the line, then they wait while the play gets called in, get set, prarie dog again, then run the play and get back to the line.
What Oregon ran under Kelly was a true hurry up. They did in fact have a series of plays called and snapped the ball the second the referee set it for play.
Experts, what say you?