Stokes spent the past four seasons with the Green Bay Packers (2021-24) after being drafted by the club in the first round (29th overall) of the 2021 NFL Draft.
Roberts enters his 10th season in the NFL and has played in 140 career games with 105 starts for the New England Patriots (2016-19), Miami Dolphins (2020-22) and Pittsburgh Steelers (2023-24).
Chinn spent last season with the Washington Commanders after originally being drafted by the Carolina Panthers in the second round (64th overall) of the 2020 NFL Draft.
Butler returns for his third season with the Silver and Black after playing in all 17 games in 2024 and recording 65 tackles (36 solo), five sacks, eight tackles for loss, two passes defensed and one forced fumble.