@Smiling gege made said sukuna is not related to Yuji but sukuna's twin brother whom sukuna at In his mother's womb is connected to jin itadori
It could be that "two face" idea must have striked in gege's as well but it must have not fit with the plot (gege was unable to fit it in his plot) so change it from two face in one body to twin brothers in one womb.
It could be that "two face" idea must have striked in gege's as well but it must have not fit with the plot (gege was unable to fit it in his plot) so change it from two face in one body to twin brothers in one womb.