As we all know, Fujitora is a righteous man who was very displeased with how the Marines and WG handled the situation at Dressrosa. Fujitora is so righteous that he cut out his own eyes because of how disgusting the world was. Once Imu’s identity and the national treasure get leaked, and the Gorosei start the “great cleansing”, it would make less than 0 sense for Fuji to fight against Luffy’s side since Fuji would clearly see them as the right side. We don’t know much about Ryokugyu yet, but he was shown being friendly to Fujitora and even ignoring Akainu’s orders to kick Fuji out of Mary Geoise, so it would also make sense if he rebelled alongside Fuji. Kizaru obviously wouldn’t rebel since he doesn’t really care about justice and is actually kind of a sadist, so he would probably enjoy helping out Imu and the Gorosei, but I don’t think that Kizaru will be an Admiral at EoS. Obviously the original 3 Admirals (Akainu, Kizaru, Aokiji) formed a primary color trio (red, yellow, blue), and Fujitora and Ryokugyu represent purple and green, two of the three secondary colors, so it would make sense if an orange-themed Admiral came along and took Kizaru’s place (presumably after someone kills Kizaru). I think that this person would be Drake, given that he is orange-themed, is one of the strongest Marines after the Admirals, and has great enough potential to reach Admiral level. Since Drake is a member of SWORD, who are presumably displeased with being loyal dogs to the corrupt WG, it makes sense that he would also rebel.