The number of rookies or 2nd year players that could be starting (or taking on prominent backup roles) this year is pretty impressive.
Decastro - OL
Adams - OL
Ta'amu - DL
Cortez Allen - DB (Allen has the fast track to that starting spot if you listen to some experts but I'm still not convinced that Keenan Lewis doesn't land that job)
Then throw in:
-Cam Heyward in the rotation on the DL,
-Another 2nd year DB behind the starters in the secondary
-Redman getting his first legitimate opportunity to be the feature running back.
-Dwyer and either Batch or Rainey getting 3rd down opportunities.
Considering that the Steelers have had primarily the same core lineup for nearly a decade now, so many new faces taking on prominant roles is going to be exciting to watch..and a bit nerve wracking too.