I doubt he would make it at nose tackle, 5'10 is just a little short there. I think he would be a waste at fullback because of his speed. The WCO likes it's fullbacks to be a little more athletic than that. When I saw his clips I was impressed by his technique on defense and how he tackled. he wrapped up the right way, he put his helmet where he needed to put it and he never gave up on the play. If I was the big man upstairs i would put him on a diet, drop him down to 245-250 pounds and stick him right in at middle linebacker, and if that didn't work, then try fullback. If he can run a legit 4.7 at 270 then he should be able to run a 4.6 at 250 and that would be good enough for mlb and or fullback.
I would say keep him at NT but he would need to get some more weight on him and there is only so much you can put on a guy 5'10