For Tyrannosauridae I was thinking of the inclusion of Tarbosaurus. The reasoning for this, to have a T Rex like species distinctly different from the JP JW design. As for Dilophosadae, there is one speies that I know of that closely resembles Dilophosaurus, the Sinosaurus from China. With the same body plan, this species could be a better more scientific representation of that type of dinosaur to the game.
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And in both cases, they represent Asian Theropods, which I think there should be more representation of, considering how many Asian dinosaurs are currently in the game.