Looking at the "Villian" trailer that featured Lockdown's voice, I have a theory of how the Dinbots might have been created. In one of the shots we see a floating object ahead of some ships. My guess it is the Vector Sigma key. In G1, the Vector Sigma key changes turns things into metal, like trees and rocks, etc. What if the Dinobots were originally Dinosaurs that turned into metal creatures that got caught up in the cyberforming process?