While M.Iupati is rated as a late-first right now, I could see him climbing to #17 with a strong Senior Bowl and combine, while a guy like T.Williams could slide. I remember watching a Sooners game and hearing some strong critiques about Williams, something about how he would drive the coaches crazy with his inconsistency.
But in any case, with the difficulty of signing top-tier FA o-linemen under the league's new salary structure, the Niners are completely depending on the draft to boost their line. A pair of first-rounders at OG and RT would make an immediate impact.