As far as I know, there are some prehistoric sharks & marine reptiles in the games like Megalodon, Mr Snappy, Drago, Etc. So why not add some Spinosaurids like spinosaurus, suchomimus, baryonyx since they have a Semi-Aquatic lifestyle (note: all dinosaurs can swim due to their bones being hollow & lightweight, not just spinosaurs) aside from that, the mosasaurs & Pliosaurs have the unique ability to walk (or crawl) on land like a crocodile to eat humans from the surface or the land.
Plus if the spinosaurs walk on land, it could be somewhat similar to the sharkjiras roaming the land
Also, if we were to add the spinosaurus into the games, we could use 2 different spinosaurus from evolution & world. Evolution will have a bipedal spinosaurus while the world will have the accurate quadrupedal varient