I'll see your 321 lb OL and raise you a 6'4" 340 lb NT who runs a 4.9 forty and bench presses 321 lb OLs...
Here he is bull rushing a 4 star Pac12 center and casting him aside like he's filled with straw and sacking a Pac12 QB. This NT, btw, also lines up as a fullback in some goal line plays...brrrr...that's a scary sight (go to the 1:35 mark of the video)