1. I think Sasukes may try to kill Naruto to receive the rinnegan. Just like he attempted before to achieve the EMS. As of now we don't know how Madara received the rinnegan. He may have gotten Senju DNA from the battle. But think it will be something emotional similarly to the sharingan and the MS. Either way if Sasuke fight Naruto Sasuke will be emotional impacted or he will get Senju blood from Naruto (I think its obvious he must be a Senju/but it hasn't been announced).
2. Sasuke may receive it from his battle with Kabuto. I know they didn't show Kabuto gather Senju blood. But he must have some of it and I don't see why he wouldn't use it.
Other than this i just don't think Sasuke will have any other opportunities to obtain the rinnegan.
2. Sasuke may receive it from his battle with Kabuto. I know they didn't show Kabuto gather Senju blood. But he must have some of it and I don't see why he wouldn't use it.
Other than this i just don't think Sasuke will have any other opportunities to obtain the rinnegan.