It appears that the reaper who wipes out Hammer team in ME3, who seems to be Harbinger looks different, i.e. lack of double spine. Can you post that reference?
So....wonder what that back claw was/is for? Guess he really was a unique model of Reaper like EDI said. I always laughed in her face about that. Always thought that bit was the Citadel tower, not actually him, when I saw it in-game. Maybe it's something he used to connect -to- the Citadel? Like why he alone was chosen as the Vanguard, because he had the spiffy reaper male end to the citadels female end? Questions, so many questions.. "Hrrm, Tests.."