It's probably a safe assumption they won't sign all 5 to FA contracts. So maybe 3 total end up total being signed. Jackson is already signed, which means 2 out of Avila, Shelton, Dotson, and McClendon get inked.
So I figure we need 1 OG, and 1 C, where they replace Avila and Shelton with cheap young first contract players. Rams can probably get one of those two easily in this draft, especially the OG. But they may draft the C too.
Of the four pending FAs I think it is a slam dunk that they at least try to replace Shelton. It won't be some athletic type. It'll be a pivot with a ton of experience and great tape, hopefully vs SEC fronts too.