I'd probably agree with Blue > Pirate Robot. He didn't seem to be concerned about fighting Goku based on what he'd witnessed there, suggesting Goku wasn't going all out against the Robot, or that the Robot was more of a tank than a powerhouse. Blue > Metallic is debatable though. Goku wasn't going all out against Metallic, but by how much is debatable. I'd probably give Blue the edge though, since it was only after Goku started stomping him that Kuririn noted how Goku had gotten stronger than at the 21st TB.