Ok, here's my take. During scrimmages like this, coaches sometimes will tell the offense (the QB) to throw to the primary receiver. As in, don't worry about your other options, I want to see this play work with this receiver against this look. I'm not saying I know for sure that's what happened, but it's very possible. It's also very possible Heck just didn't see the RB or RVZ. Playas fuck up too. The defense is concerning.
It reminds me that I was listening to the Hawk Central podcast and one of them, I think Tyler, was concerned about the kicking game, and noted once when they didn't even kick the ball, and had to scramble. Now, I didn't see that particular play, but again, my first thought was the coaches wanted to see the scramble drill live against a defense so they told the kick unit to pretend it was a bad snap and run the fire play.
On a side note, I generally like the HC podcast, but the way Tyler Tachman talks kind of grinds my gears. He puts a W in the word "but" so it sounds like "bwut" and he says it frequently. He's also one of those guys who says "impordint" and "pordal". Very petty, I know, but now that I've noticed it I can't unnotice it.