As cool as it would have been, I almost feel as though a scene similar to the Carno scene in TLW novel may have been a fitting final setpiece for JP3. Perhaps the group doesn't stumble across the old Ingen facility until closer to the end of the film, after the last Spino and last raptor attack. Maybe they set up some sort of beacon in hopes that Ellie received Grant's call and got the message before the phone was lost. The group decides to spend the night in the old Ingen facility, and that's when they run into a couple of Carnos, complete with TLW style cammo ability.
Dinosaurs still rule the earth