The studio should stop trying to complicate things. Keep the plot relatively simple. Bring back Dr. Grant, Dr. Satler and Dr. Malcolm. This is the basic plot: A scientific expidition is being set to go to Isla Sorna under a new corporation who now owns Ingen.
In the opening scene we go back to Isla Nublar, we see what remains of the old park as a group of 3 mercinaries treks through the park looking for an item relative to the plot, but of course they are attacked.
The 3 original cast members get recruited as advisers to the scientific expedition team. Through different reasons they all agree to go on the expedition. But the new executive is not who he seems and is actually planning something else for the dinosaurs and for the team. So the team gets caught in the middle of the mayhem.
And we find out why Ingen is creating new species of dinos that were not on the original list like the Spinosaurus and the Pteronadons.
The dinos returning in the film should be T-Rex, Spinosaurus (rematch please), Raptors, Triceratops, Pteronadons, and a bunch of Herbavores that nobody really cares about. New dinosaurs should include Utah Raptor the new badie, Carnotaurus, and a cameo by Dilophosaurus.