Scherff & Castonzo. Both of whom should be retained by their teams btw.
Scherff would be a Timmerman-level upgrade on the interior for us and would settle things down. But I think a lot depends on the handling of Callahan... If the Skins retain him as head coach they will tag or sign Scherff (BC loves him), if not all bets are off and if BC goes to another team I have to think Scherff might favor that team.
Castonzo I think is a bigger longshot. But if he hits the market he makes a ton of sense for us. Colts do have a lot of contracts to sort through, and IMO it's a mistake to let him walk, but he is 32 and maybe they have other plans who knows. Reason I call him a bigger longshot is because LTs in their prime tend to not hit the market and when they do it's a bidding war which the Rams seem ill suited for.