I dont think they were all that close. I mean chuck and logan were gonna get a boat and leave him behind. But i mean he must have cared for him to some degree but it wasnt a big deal for me. It was more about Caliban atoning for his past, soemthing logan is always doing nd charles aswell even if he didnt remember untill right b4 he died what he had done(really not his fault). I liked Caliban in this he was more inline calibanish then the weird **** we got in apocalypse. Woulda been cool if everyone in theyre got afraid when wolverine and X23 come and caliban feeds off it and beats put. Though thats more of a fan fiction thing id just think would be cool but would definetly not fit or help in this movie. Just wanted to see that predator version of Caliban who feeds on fear for a second given how he was treated by everyone, even chuck calling him "That fu**ing albino"