That man-made bot in the showroom is Deception Stinger, I'm guessing he was the only prototype made and finished and at some point turns evil and obeys Galvatron or Lockdown. I'm guessing Galvatron was built by the humans, I think they took Megatrons corpse and fixed him up , but Megatrons brain was still intact but somehow the humans restarted it or something which created Galvatron, and he took over the factory and started making those fugly Vehicon drones and he took Stinger under his wing.