I said this last year, and I'll say it again.
Rocco can only play the players he's given. And, they are less than 2 full weeks into the season. Should he really have given up on Duffey and not used him last night? What, exactly, would you have done other than that?
I too am surprised by the lack of piggybacking, but Archer's injury may have played a part in that.....Also, and I'll say this again, I'm 100% sure they have a plan for using the "starters" for the first month, and it isn't just Rocco making that plan.