Really wish we'd seen more of that guy. (The River Ghost, that is.)
To me it would have been one way to REALLY improve Predators, was to have the River Ghost join the team
after the big reveal that they're not on Earth. Sure there is the language barrier, but Royce and it could have realized quickly that they both are on the same side, and language barriers didn't stop 'Alien Mine' or Scar and Lex in 'AvP'.
At first the River Ghost could have been following the team like Gollum in the Fellowship of the Ring, and after an attack with the Hell Hounds the River Ghost saves one of the humans from a Hound for instance. Then they let the Ghost hang around at that point, but of course some don't trust it.
It would have made a much more otherworldly and better team dynamic in my opinion!