Its his turn to get pared with someone because, as much as I saw, when one of them (him and Naruto) does something or gets a power-up the other one does it too ( in his own way ofc). So who should it be?
I choose Karin 'cuz SasuKarin babies will have the rinnengan like NaruHina babies. :D
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sasukes next powerup might be connected to karin juugo and suigetsu kabuto was able to take their abilities and discovered sage mode, now orochimaru is with sasuke too, they could find away to blend them in somehow, sage mode + ems freaking ultra super sayan..