The whole bridge scene was ripped straight from movieland as a conveniant heroic sacrafice for Sunstreaker, I just thought a little padding might make it mor meaningfull. Now if he comes back he'll be redeemed because of his sacrafice and all will be forgiven. It would have been cooler If Drift had saved him and forced him to live with his guilt and the hatred of the other Autobots.
I really miss the Marvel days when I actualy felt despair when chracters died, sure they often came back, but at least they waited a few years.