There was the woman in Predators and she didn't seem out of place at all. At the end of the day, it's not the strength that beats a Predator, it's wit.
Not sure that is the best example of being present is equal to a threat, as clearly the doctor should not have been there as it made absolutely zero sense for a mentally unstable, homicidal doctor to be on equal par with a soldier. It made for a not so clever twist that people can be predators too. And if it's wit that makes it so interesting to watch a Predator movie, why not just have a group of smart kids fight a predator?! Call it Goonies vs. Predator. Or hell, just make a film of the Archie vs. Predator comic, watch those clever kids outsmart that dumb ol Predator. And if all you need is wit, then old Arnold could still fight the predator in the new film. He could smear mud on himself again and make cool traps again.