Yes, forgot about the whiff, which was bad, but he's young. IMO, down the road, they need to add a space eater in the middle with Donald & Brockers on the outside and maybe look to deal Barron for a thumper next to Ogletree and that's why I liked Forrest.
IIRC Phillips said earlier on (paraphrasing) that he doesn't need a traditional big NT and that he was getting away from that type. At the time I thought it was weird but, he is the Son of A Bum. I could not find the article when he was hired for the Rams but this mentions him using both but, smaller ones for the one gap defense. I'm sure he could have kept Purcell or found a bigger NT but he didn't. Could be that offenses will run more against the smaller quicker 3-4 D Line. Could be the Rams lack discipline and knowledge to be effective early in the season.
http://webcache.googleusercontent.c...-denver-broncos-nfl+&cd=1&hl=en&ct=clnk&gl=us
4. Be willing to adjust the defense around your nose tackle.
This might be one of the secret sauces in Phillips' defensive recipes. He's made his defense work with undersized defensive tackles such as Greg Kragen, Jay Ratliff and others. He's made it work with massive nose tackles such as Ted Washington.
Because Phillips uses the one-gap scheme, he likes his nose tackle to penetrate and attack the line of scrimmage. Normally, a nose tackle is going to two-gap or get double-teamed. To counter that reality, Phillips will take the smaller, lighter nose tackle and stunt him.
"They say those smaller guys can't play nose," Phillips said. "Ted Washington [who was 6-foot-5, 370 pounds] didn't stunt much and played more two-gap. He played the one side and was big enough to fill the gap on the other side and penetrate. But the undersized guys you can stunt. It's all about what they can do."
https://www.profootballfocus.com/news/pro-why-rams-scheme-change-wont-affect-aaron-donald
Today’s 3-4 defenses are very different animals, and predominantly one-gap systems, just like the 4-3. The NFL is generally a one-gap league these days, and there is very little two-gapping deployed as the league has trended towards smaller, quicker players across the board. Gargantuan nose tackles of the past like Ted Washington, Gilbert Brown and Grady Jackson have been eased out in favor of more athletic players that can move down the line, rush the passer, and not just occupy space. Sub 300-pound defensive tackles are not uncommon, and you will even find 3-4 nose tackles that barely tip the scales at over 300 pounds.