So this was suggested early on in the games history but many people complained and said its too OP . Now with Mortem Rex and Apex level of rarity it allows for something as powerful as Ultimasaurus to be a boss. Alternatively it would be awesome as another unique. However most of the main dinosaurs used to create the ideal ultimasaurus have multiple hybrids. So I compiled a few that are good candidates that are from the same family as the original dinosaur components. Anyway Im sure ludia wont add this cause of Allosinosaurus and Trykosaurus but I thought id appeal to those who love this hybrid.