I agree that C.Campbell would go a long way towards fixing our Dline issues. He's a monster. He's already 30, so probably not the ideal long term candidate which he'll be looking for in UFA.
Anything outside of him signing with AZ or SF would be a huge plus though even if we don't re-sign him.
At 27, Kawann Short would probably be a better long term option, but if Campell is willing to take 2-3 year deal then I would jump all over that.
Lang and Zeitler at OG will be hitting the market as well. We are 1/5 of the way to a solid Oline. 2/5 if Ifedi can progress. We have got to figure out a way to find a LT in a market where there are no legit LTs.
It's dangerous picking one of the 2nd tier LTs in the 1st round as they often don't amount to anything.