What do you think Juggernaut's Origin is?

I don't think Juggernaut is a pure Astro. I think he could either be from another alien species that the Astro's concurred. They then turned Juggernaut into one of their best warriors after concurring their species. Another idea for his origin is that he was some kined of experiment by the astro's.

The reason why I think he's not a pure Astro is because his child was seemingly an Astro toilet with a dog head. He loooked very diffrent from the other Astro's.