The offensive line was a huge disappointment for the Jets in 2017, especially on the interior. In 2016, Wesley Johnson started eight games for the injured Nick Mangold, and the line didn't seem to suffer too badly. However, he struggled throughout the 2017 season after moving into the full-time starter role.
Guards Brian Winters and James Carpenter also failed to play as well as they had in 2016, although that may partly have been caused by Johnson struggling on their inside shoulder. Injuries were also an issue here, with Winters in particular playing most of the season hurt, and eventually requiring surgery on an abdominal issue.
Dakota Dozier's performances in relief of Winters over the past few years have some people wondering if it was really wise to give Winters a big money extension, when Dozier doesn't appear to be much of a downgrade. However, he's out of contract now, so the Jets may need to replenish their depth.