Does anyone have an idea how, speaking in crude physiological terms, his brain differed from that of the rest of humanity? I mean the things he did seem unreal, it's like he was connected to some other weird realm that revealed hidden abstract concepts to him.

You can somewhat imagine how Newton, Gauss, Euler etc were really smart and quick and would cycle through ideas and make connections fast but Grothendieck seems like on another level.

You can see how someone would be able to
beat Gauss or Riemann to the punch with their discoveries, but without Grothendieck would there even be be Schemes?

Was his pineal gland more developed or what.