NotPolarArtic
Why didn't he steal the Mangekyō Sharingan? He could simply transplant it to his hand and, on a special occasion, merge them with the ones he already has in view. I'm not sure how evolution works, but is it replacement or fusion? If it's just replacement, they could be exchanged between siblings. I think it's more like fusion, in which the pair of unused eyes lose all the special chakra they have, showing the abilities of the two people, or if they are similar, a fusion of these. He also has one of Shisui's eyes from Itachi's memories; I don't know why he didn't take the other one from Danzo to have the complete pair. Thanks for the chapter.