Spoilahs ahead yo
Blackrock sure did look a lot like Tony Stark -- at least he did to me when I was a kid.I'm sure one wouldn't go investing and developing so much high tech if he wasn't reasonably cluey about it. <shrug>
As for Hippie-Spike over Buster or Ethan (or Charlie Fong), I guess it's because he's the one human on the planet who has Nebulan Bio Engineering in him. It's interesting how they've also explained how binary bonding involved permanent cybernetic implants; because in the original G1 comics - to me at least - it felt more vague... more like "binary bonding" meant putting on a cool exo-suit that let you transform and binary bond with a Transformer -- but otherwise you were just a regular human. And I thought that prolonged exposure to the technology allowed users to form a psychic link with their TF partners which was amplified by the tech. But being cyborgs does make sense, and explains why Sparkplug spiraled into anger and depression after seeing what they'd done to Spike (as well as the ordeal that Buster had been through).