2. FB Derek Watt
If the Steelers wanted Derek Watt on the roster, they would have re-signed him by now -- it's really that simple. While Watt has been a Pro Bowl special teams player in his career, he offers next to nothing on offense, and Matt Canada couldn't find a way to get him involved.
It looks like Connor Heyward is ultimately going to take his place. Despite being listed as a tight end, Heyward has the ability to assume fullback and H-back duties for Pittsburgh. Between the two, Heyward just looked like the more valuable and versatile player in 2022.
However, things can change at a moment's notice. If the Steelers get into the season and decide they need to add a core special teams player, they could make room on the roster to bring Watt back. This would likely require them to part ways with one of their four tight ends.
It's also possible that Watt could be a player added to the roster if the Steelers suffer an injury at tight end. Though not a tight end himself, Heyward could go from fullback duties back to the H-back and 'move' TE role, while Watt could essentially be added for depth and special teams purposes.
It's a longshot at this point, but Watt is a free agent with clear and obvious connections to the team with his brother being the three-time Steelers MVP and Derek sporting a black and gold uniform for the past three seasons.