Just banish InGen from the island. So what, they made it? Give the island it's OWN rights. No one should own it, but the animals who live there themselves.
Escape is not likely. A Mosasaur? It would be spotted very quickly. Many animals may die, but let's just completely eliminate that option of even breeding one. Ptereanadons I doubt would migrate anywhere. They live close enough to the equator. Do you expect a velociraptor to swim 120 miles? I doubt it.
I saw keep the island alive, or don't bring it back at all. What's the point of raising something you've worked so hard on, you decided this to be your life, then within 2 months, it's gone.
I believe Dr. Sorkin would back me up on this. ^-^
Too bad she got eaten.