I would have to agree with him. The Yautja should win. The enviorment is perfect for them besides it being a rainforest. They can still be stealthy as hell without the cloak though. The Seals are skilled, granted, but the Nigerian militia and military sucks. They're like the Persians in 300. They'll be killed in massacre scores by the Yautja.
I don't know if the Yautja can kill both the Seals and all the Nigerians but they'll leave atleast a hundred dead if they try and not **** around like they do in the films.