Sooo...
Dutch has military experience, very good at building traps and being Arnold Schwarznegger and all probably has the higgest sheer strenght out of the entire group
Harrigan is too old for this shit
Royce and Isabelle given their history together might try to kill everyone else before going after one another. Royce being cynical sonovabitch he is will probably lie to others that he knows a way out luring them into a trap, much to Isabelle's disaproval, outcome depends on how believable he is. Also, he probably will be the only one cold-blooded enough to go after Rory
McKenna will do his best to protect Rory but probably will go down one of the first. Both he and Isabelle without their weapons will be lacking their main advantage. Although McKenna might have a serious edge over others if he still has invisibility ball in his pockets.
Rory given how good he is at learning languages would probably be the only one to communicate with Naru and maybe even convince her to help
Casey is a biologist so she might be able a la Edwin to use some of poisonous flora of the planet
Naru ... wait, shouldn't she be dead this far into the future ? Ah f**k it, Preds kidnap her and put into suspended animation for 300 years. Naru will probably hide and observe and wait for others to take care of one another before going after whoever's left standing. Probably with bow and arrows ...
Man, this is harder to decide than I thought!