The San Francisco 49ers have significantly overhauled their offensive line in 2018. The team spent big bucks on center Weston Richburg and spent a high first round pick on tackle Mike McGlinchey (immediately followed by trading Trent Brown). They did not re-sign guard Brandon Fusco, and instead signed Mike Person to compete with Joshua Garnett at right guard.
Add in a cutdown day trade for tackle Shon Coleman and a modest signing of offensive lineman Matt Tobin, and plenty has changed from 2017 to 2018.