We don't know the strength of anybody on this Offense. (except for Pickens)
TBH... the QB and RB coach don't seem that impressive either but whatever. Someone said it above (Tomlin alone should not pick staff)... but I doubt they get a high quality OC anyway, not many young OC (up and coming football minds) have been lining up to work with Tomlin in the last few years.
...some Tomlin lackey asked about Offensive Lineman trades...
According to the folks over at Pro Football Focus, Dotson is the highest-graded guard in the NFL this season with an 85.3 grade. Meanwhile, for the Steelers, his replacement Isaac Seumalo has a 63.8 grade
the other guy was a starter for the Texans and was doing really well too until he blew his knee out.
Like I said, Offensive staff needs a complete reboot (I doubt Seumalo is bad but I'm 100% his couching staff is) but you will have to fire Tomlin to get new good coaches. Tomlin will hire someone who will be a lifer/average because that's who this team is.