I would love it if they all come back and every animal coming back is a must for me even if it is in dlc. Ultimately planet zoo has close to 200 animals no where near what JWE1 or JWE2 have so it would make dlc so much harder to market when the base game roaster already has so much especially since if they didnt add anything new to the base game no one would get the sequel so a solid 20-40 animal minimum would have to be new.Frankly I'd be mad at Frontier if any animal from the first game, base or DLC, was sold in a DLC in the sequel. They already have the models, sounds, and animations, and JWE2 managed not to sell any prehistoric creature from the first game as DLC (except for the Huayangosaurus and the Secrets of Dr. Wu hybrids), so why can't Planet Zoo do the same and have every DLC animal from the first game be part of the base game in the sequel?
Also depending on how the sequel is made all the coding and models may need to be changed anyways