Just as T-Rex was Jp1's and the Raptors were Jp2's.
I liked seeing the other bad guys(Pteranodon & new Raptors) like similar other bad guys in the first two movies, but JP3 was the new guy's (Spino) chance to shine. Just like we wanted to see more of the T-Rex in JP1, Spino should have been in JP3 more. He was supposed to be the new biggest and baddest dino on the block and should have been better exploited. I agree that he, Spino, just seemed to appear out of nowhere and had irrelevant screen time, but that's an objection to the director/screenplay. Spino should have been more involved for the RIGHT reasons in JP3.
HAVE FUN