I see what you're saying about them being undersized to play on the line, but I'm not sure you watched any of his plays in coverage if you're suggesting Nelson should play ILB. And neither Nelson nor Tannor got pushed around - Payne and Gunnerson did, but that's to be expected when Payne was still figuring out playing lighter and Gunnerson was playing his first games in college.
We need another NT to be comfortable, but it has sounded like the coaches really like Wildeman, Newsom, Buckley, and Black. They've just been blocked by a glut of upperclassmen, and hopefully they are able to rotate instead of start and bank up some in game reps. DL is definitely the shallowest group right now, but at end I don't think it's worth adding bodies just to have more numbers. If there's a surefire starter grab them, and I'd take any nose with potential at this point just for depth.