Yea that would help tighten up the story and most of all it gives a logical reason for introducing an alien species into the wild and a consequence for doing so that would lead to man making another bad decision. That's the start of a plausible movie.
Hunters and poaching is definitely going to have a place in the story. It's inevitable in such an environment. To over use them would harken to JP2 and mercenaries were used in JW... meaning that we could pull them into the sequel. In any case you need to work out the big bad.
![Tongue :P](https://www.avpgalaxy.net/forum/Smileys/fugue/tongue.png)