[Baki] Pickle's origin sort of explains all the crazy stuff in the entire seriea
The fact that Pickle lived with the dinosaurs means that in the Bakiverse humans were prey animals that had to adapt fighting dinosaurs.
Meaning they most likely never had time to evolve rational brains and had to adapt to immense evolutionary pressure.
And given that he doesn't say HOW the dinos went extinct it could very well be that Baki Sapiens had to kill the dinosaurs themselves. Hell it is entirely likely the Baki Sapiens didn't have time to really develop tools or rational thought and technology and tools came way later after we they were gone. So every single human ancestor was a paranoid stressed out muscle freak that had no tools except their fists and had to adapt their bodoes to survivong fighting thunder lizards, hance weaponized schizophrenia.
So everyone now is a hyperviolent muscle freak with weird powers because they descend from those people.