The final free agent that could be an option for the Buffalo Bills after Matt Milano's injury is Jon Bostic. He is a veteran linebacker who has played for five teams in his career, which began in 2013 as a second round pick by the Chicago Bears.
He has 86 career starts during his NFL career, a majority of which came between 2017 and 2020 when he had one year stops with the Indianapolis Colts and Pittsburgh Steelers before two years with Washington as a full-time starter. He would remain with Washington in 2021 and 2022 but he was primarily a backup with only nine starts during that stretch.
The reason that Bostic makes sense for the Buffalo Bills is he played a number of years in Ron Rivera's defense. The defense that Rivera runs is similar to what the Bills have run under Sean McDermott as the two coaches spent a number of years together in Carolina with the Panthers.