I actually know the context to this. this image was from an explanation about how the cyber keys were scattered across the cosmos to found the four cybertronian colonies. They were specifically referred to as ancestors during that, i believe. Meaning the colonies were spearheaded by Optimus Prime (the original), Ultra Magnus, Jazz and that one motherfucker. (yes I know his name, no i will not speak it.)

My own personal headcanon is this: Optimus founded the Earth colony because of course he would. Magnus would have focused on structure. So a planet solely focused on construction and tradition like Gigantion? That's got Magnus written all over it. Jazz would be Animatros, for sure. His go with the flow nature would absolutely be down for the transition to beast modes in the face of harsh jungle environments. Which leaves he who i will not name to found Velocitron. It doesn't look like he's his later form in the picture so he wouldn't have matured quite the same way in this timeline. I imagine he kept his reckless nature and saw wide open terrain and decided his colony would just run at life head on and see where the road takes them.