.
Dude if it's a based on the first tournament which takes place on an island fortress and has a relatively slim roster then I doubt it would be that hard to flesh out.....You add the other elements in as the franchise goes on.
It's really not rocket science because it's not much to really "explain" if you arent trying to shoehorn EVERY games plot elements from the start Introduce it throughout the trilogy.
I agree they can do a little bit of that stuff little by little, the first movie did some of that, they did it right for the time, annihilation tried to continue on the same vein and amp all the fantasy stuff and failed, looks like legacy 2 is going to do something similar to the first movie, except they get transported to the island, exactly what i thought about as soon as i saw the predators movie and i thought it would work really well for mk, it looks pretty cool to me and seems like kevin is not abusing the fantasy elements of mk. The movie sequels will fail if kevin starts bringing in all the fantasy elements slowly and then change directors for the sequels, it will be annihilation all over again