Armstead is the grown-up in the middle: long, powerful and smart about how to affect a play even when he is not the one finishing it. He makes the edge rushers' lives easier.
Strengths: Length, interior pass-rush power, run-defense experience and veteran leadership make him a front-line difference maker.
Weaknesses: Age and accumulated workload can affect burst, and he is most effective when his snap count is managed intelligently.