For now, the Pittsburgh Steelers have Cassius Marsh as their third outside linebacker behind starters T.J. Watt and Alex Highsmith. However, whether or not Marsh winds up being the number three outside linebacker 89 days from now when the Steelers open their 2021 regular season on the road against the Buffalo Bills is a different story and that’s because we could very well see the team add another experienced edge rusher before then. On Tuesday, Steelers defensive coordinator Keith Butler didn’t necessarily shoot down the notion that another outside linebacker might ultimately be added to the team in the coming weeks and months.