Here's the picture taken from coaches film of the Rams safety. Once again, if the offensive line blocks Barron there's a good chance Jones gains a lot of yards on that run.
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In the NE game, again it was 1st. down backed up at the 1 with Jones on the carry (3rd. quarter, 7:02). It was a different defensive alignment with different blocking assignments, but essentially the same run to the same spot with Linsley sealing left (instead of Bell) and Bell/Spriggs sealing right (instead of Bulaga and whoever was next to him).
In the NE instance, the LB Roberts shot the gap, was unaccounted for as with Barron, but just missed on a diving tackle. And Bell threw himself late at Roberts just as Bulaga threw himself late at Barron.
Had Roberts cut Jones down, it probably wouldn't have been a safety, but maybe not more than a yard. The only difference was Roberts looks like he had a slighly deeper set than Barron, and slighly offset left of the hole wherease Barron was right in front of it.
Given we have two examples, I'm inclined to believe that not accounting for the ILB is intentional--punch open the hole (which they did in both cases) with the runner hitting it quick (which is probably why it was the quicker Jones and not Williams), beat the LB to the punch. The diving linemen coming off the double team look like reaction blocks if they see the LB coming to get at least a chip assist on him or screen him off.
Barron was just to well positioned and too quick. You can see him in his run blitz to the hole before the ball is even handed off and Bulaga couldn't get a glove on him. On the other side, I get the double team on Donald, but why the heck is there a lineman way out worrying about 96 on what is obviously a quick hitter to the hole.
All in all, this is pretty risky business.