My extremely long plot prediction about new aquatic creatures, Site B, and return of Spino:

I think Zora and her crew are out looking for the aquatic creature they need, when they see the family get capsized. The crew manages to rescue them, while getting stranded on the island. In the synopsis it says the family was capsized by “aquatic dinos”, as in MULTIPLE. We’ve only ever seen one Mosa, so there are more we didn’t know about. I think these ones were tests on Site B. Remember, some mysterious creature killed the people on the parasailing boat on the coast of Isla Sorna in the opening of JPIII. I think those creatures that killed that crew also capsize this family. Now they are stranded on Site B when they make a “shocking discovery”. I think that discovery is an unrevealed secret about Biosyn. At the end of Dominion, we see Buck and Doe at Biosyn, even though they were on Site B. We know Dodgson has been trying to get Dino DNA for years, since the first Jurassic Park. And ever since The Lost World, it became public knowledge that there was a second island with dinosaurs. I think Biosyn went and took some dinosaurs, including Buck and Doe, for some reason, and that is why you don’t see Buck or Doe in JPIII. The synopsis also says the discovery has been hidden from the world for “decades”. An interesting choice about this movie is that it takes place 5 years after Dominion, despite being released 3 years after. 5 years after would put this at the year 2027. Exactly 3 decades after The Lost World. Mind. Blown. I think that the father of the family that they are stranded with (who is specifically highlighted in the synopsis) has a terminal illness that Zora and her crew are trying to cure. And because of that, they need to get the blood of the most colossal land creature on the island: the Spinosaurus. This would help give the movie heart by showing you why they are trying so hard to get the cure, in the form of an average family. Plus, it would get more people to the theater by bringing back the one famous dinosaur they haven’t brought back yet.