The latest Manga ,Momoshiki told Baruto that he got the curse seal from killing a God (killing him).If Kawaki also have a tattoo on his body,that mean he also kill a God.We do not know any other God beside jj Madara,Kaguya,Toneries etc(which all decease).Sasuke is currently the So6p/God of Naruto,wielding the sharinnegan ,ashura blood line(Hashirama dna and chakra),Indra blood line etc.So this mean Kawaki kill Sasuke with help or by whatever methods to gain a Curse seal????