Because Rhule kept him and is no dummy, I wonder if the two sat down and talked o line philosophy and concepts extensively with Raiola doing most of the taking. Assuming Raiola hit it out of the park and jived with Rhule's vision, it then became an easy decision to keep him. That, and he probably did not have that position pre-chosen, as in he couldn't get his first choice or two.
People need to settle down. Raiola knows elite line play and people vouch for him. It's just that we don't know him all that well and he was not a miracle worker his first year which is unfair IMO.