maybe, but god oh mighty not 50 cent, no music people >_< maybe an ordinary civilian like a doctor or something, but chances are they arent going to make it. the guys in the other movies we tough and prepared, thus getting to be the main character, they were above the average human i would say. They were almost killed in both movies even when they were tough as heck, which meomeone with less skill then them would not make it. buuuuuuuuuuuuut if you could choose then i would say a retired army peep.
EDIT: i also dont think they should choose someone weaker, it would start to poke fun at how powerfull the predator really is :C
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