I think Shisui Uchiha is possibly alive. So in episode 264 of Naruto Shippuden Timestamp 16:35, Kabuto was talking about the reanimation jutsu. He said that he could not find Shisui's body anywhere, and we know that Shisui committed suicide and fell into the Nakano River. We can make the theory that the Nakano River leads to a village and the people from the village helped Shisui. If so many Naruto characters could survive a fall then why can't Shisui? Yes, he would have been blind but he would still survive. Maybe I'm just clinging to a scenario where Shisui is not dead because he is one of my favorites, but who knows what Kishimoto has planned, we all thought Obito was dead did we not?
Anyways there is my rant that possibly no one is going to read.