I like everything you're saying here, but has Lang bulked up enough to consider moving him inside? He showed up as a TE/DE.
He's over 290 now and has steadily put on weight. I think Lang can get to 300 and still be effective. It seems everyone is down on him because he wasn't a super star this year when he played. It was his first year playing the position w/out a spring. I think w/ an off season, spring & fall practice he could be one of the most improved players along the DL. I don't think he'll be all-SEC, but if he can play 10-15 effective snaps that's a win.
The DL should be solid adding two P5 starters plus what's returning. Also, there's rumors Slaton may come back.
Adding an SEC caliber OT would be huge.