Orichimaru use edo tensai to bring back shisui to manipulate itachi to kill his clan because oroichimaru was always weak against it so he wanted them dead also he left sasuke to get his shairangan the ultimate plan so I see orichimaru the final villan
We all know shisui can control you maybe oroichimaru manipulated him to control itachi of killing his clan then he have this thought that he acually did it so its all planned for sasuke to come to orichimaru then oroichimaru finaly gets to have the shaigran I think orichimaru actually planned...