While Roethlisberger most likely won't do for a TE what Bree's does, let's compare the stats over the last 4 years for 8 time Pro Bowler Antonio Gates (SD) to Heath Miller (PIT).
Gates - 58 games - 251 receptions - 2861 yards
Miller - 60 games - 255 receptions - 2705 yards
So while Gates is a much more well known TE and the star of the Sand Diego receiving corps, the starting TE in Pittsburgh (Miller) has been utilized just as much as Gates over the last few years.
Heath Miller announced his retirement last month. I think Ladarius is coming into a great passing offense and his upside is very high.