>>13763326The chibifying is a valid point when it's about a children's game. There are always details that are deleted due to simplifying a design.
I was suggesting the more upright sauropods due to Amarusu being posed like that, but I can see that it'd turn horizontal after evolving.
Seismosaurus as a species is debatable as my main source (paleodb) and other sources claim it to be Diplodocus.
If it really were to turn out to be the longest and not tallest it would undoubtly be based on diplodocids than other sauropods.