Thanks, anon! 🙂
I have a headcanon that the Kuwabara in Yu Yu Hakusho is somehow related to the Kuwabaras in Hikaru no Go, mostly because there’s a scene where Kuwabara-Honinbou is implied to be able to sense Sai? Seeing spirits is a family trait.
And since the events of Yu Yu Hakusho are about a decade before the events of Hikaru no Go, maybe he can make a cameo?