I'm surprised the article and comments haven't mentioned the axial twist hypothesis [0], which IMO is the best explanation I've seen so far for contralateral wiring. The axial twist hypothesis has experimental evidence and is also predicted from physical first principles of what is known about embryonic development. It explains the central decussation, which is a stronger prediction than the existence of some decussation (from what I understand of the article). I still don't quite understand how one gets from the existence of a decussation between two distinct body-cortex paths to contralateral organization, but maybe after reading the paper I will get it.

That said, wonderful and simple result.

[0] https://en.wikipedia.org/wiki/Contralateral_brain#Twist_theo...