carnivor is just a meat eater and i think that would be lieopluradon if you mean dinosaur i think its giganotasaurus but spino is one of the biggest yes.
This game has major scientific flaws to it, especially the Spinosuarus like you stated. You are correct, Spinosaurus was the largest carnivore ever, but this game was made before that discovery was made ^^;
You might want to rethink that one today, buddy. Spinosaurus is now in 3rd place since recent studies make Carcharodontosaurus the largest carnivore ever since it out sized and outweighed the spinosaurus. Carcharodontosaurus' weight is now 11 tons, and spinosaurus is now 9. The Carcharodontosaurus is taller than the spinosaurus by 5 feet, but spinosaurus is still longer.
Me too, one of the best PS1 games I ever played, but Hydro Thunder is still my number one :D If they did do a remake of either this, or Dino Crisis (The original or 2nd) i'd totally buy it :P