O-line a concern for SF?

Matt Barrows of The Athletic describes the “blockers in front of [Trey] Lance” as “question marks.” The real issue is along the interior, where nobody’s locked into a starting spot. Of note: C Alex Mack, 36, is questionable to return for another season. And reliable RG Laken Tomlinson signed with the Jets in free agency. The 49ers used a mid-round pick on UTSA OT/OG Spencer Burford, but he’s unlikely to make a year 1 impact. Lance remains a fringe QB1 with a wide range of outcomes.