Currently we assume Silverbolt and the Wreckers are Autobots. The ship in Detroit I believe is Silverbolt. Given the similar motif of being heavily armed that could mean they are from the same group. Now we haven't seen a Autobot or Decepticon symbols on these guys. I posit the theory they are neither Autobots or Decepticons but Neutrals. Heavily armed Neutrals that is. Which could mean the event that triggered the space race would not be known by the Decepticons or Autobots as they do not have jurisdiction over these bots.