The choices of you poll are all dead, flatline, spark extinguished, beheaded. Only Decepticons that can make a return are Megatron, Barricade, Berserker (if TRF releases him).
I think that's the point. He's asking which wasted 'Con you'd like to see brought back. Though Barricade is t dead.
I still think Devastator is alive but the military only shot one of his vehicle parts during the pyramid scene in revenge of the fallen.
Devastator was never shown in the movie to be made of individual robots, only vehicles. Maybe he was meant to be made from the constructicons, but they were in another battle at the time. I think Devastator is one robot made from smaller vehicles that are controlled by the head or spark. When he was shot, it destroyed the spark, and therefore all the individual vehicles became inactive.
Barricade, Mohawk and Nitro Zeus. Mohawk's head is still alive, so there's absolutely potential for him to return. I REALLY hope they can bring Nitro Zeus back, and just have it so he was merely injured by Bumblebee and managed to survive. Nitro seems to have exploded in popularity and with good reason as he probably has the most personality out of all the movie 'Cons. Hopefully the folks in charge notice his popularity (He got pretty damn far in that Fan voting thing the official website hosted, even beating Lockdown).