Was the apatosaurus a producer?
Were they paid for their roles or was their appearance just a marketing ploy?
A production company's decision to cast an animal in a film is a very personal and private decision. It would not be possible to find answers in any of my research and personal experiences (since these are all from my perspective as a human audience) .
I hope these articles will put to rest the rumors of this dinosaur on the horizon. It's also worth mentioning that, as of this writing, we still have more to look at in the film. There still are rumors, but I don't have any official comment yet.
So in short: This dinosaur is more than likely not going to play in Jurassic World. It's one of those "would you rather?
" kind of stories. Maybe it does.