Not really sure what your point is.

As a redshirt Soph he is within 5 and 12 pounds of two of the three players you mentioned, should those weights be correct including Correll's.
If he is a legit 6'3 300lb'er that is not small as SEE pointed out.

IMO the staff must see something they like. They do of course have options with Grunhard and Lugg. Correll has been the backup/understudy to Patterson this year. I don't know if he is physically ready to play a full game and maybe the staff rotates. Lugg did some snapping in the Spring and obviously has a better grasp of coverage's etc. with his time in the program at Guard and Tackle.

The Bottom line is it sucks to lose Patterson. Especially down the stretch in a season like this.