Why? Because McQuistan is a canary in the coal mine for the releases to come. Teams will be cutting dozens upon dozens of players in the weeks ahead, and while close to 90% of them will be of no use to the Falcons, there are a few players who could actually be useful.
Projecting those players will come later, when the rumblings around who's getting the axe become more concrete. We can start with McQuistan, a 30-year-old versatile lineman who started at left guard just a year ago for the Seahawks and played pretty darn well. If the Seahawks cut him, the Falcons might be interested as a versatile backup with quite a bit of experience, given the relative youth of their current backups.
Anybody you have your eyes on who might get the axe?