SF 49ers: Post-2021 draft bubble watch for 53-man roster

SF 49ers bubble watch: Offensive Line

Lock: Alex Mack, Daniel Brunskill, Laken Tomlinson, Mike McGlinchey, Trent Williams, Aaron Banks*

Strong bubble: Colton McKivitz, Justin Skule, Jaylon Moore*

Weak bubble: Shon Coleman, Tom Compton, Dakoda Shepley

Long shot: Jake Brendel, Corbin Kaufusi, Weston Richburg, Isaiah Williams

Offensive line depth will be one of the SF 49ers’ biggest training camp storylines this summer, as the depth behind the presumed starting cast of Trent Williams, Laken Tomlinson, Alex Mack, rookie Aaron Banks and Mike McGlinchey is almost completely up in the air.

McGlinchey, who just received his fifth-year option, isn’t going anywhere. And Banks, a second-round draftee, is likely going to take over at right guard, thereby moving Daniel Brunskill into a more valuable uber-backup role where he can support either the interior or tackle spots.

Western Michigan lineman Jaylon Moore, selected in Round 5, presents an interesting challenge to returning veterans like Colton McKivitz, Justin Skule, Shon Coleman and Tom Compton.

Coleman hasn’t played a single regular-season snap since being picked up by the Niners in a pre-2018 trade, so he might be on the outs along with Compton, who carries zero in guaranteed money despite being re-signed by San Francisco to a one-year deal recently.

While neither was particularly impressive last year, both McKivitz and Skule likely hold the advantage of some of the camp-body options buried deep on the depth chart.

Center Weston Richburg, who has been out with a series of serious injuries since 2019, could potentially retire this offseason, and it’s likely the SF 49ers make their move after June 1.