I too think Grubbs are inspired by native americans, if you looks at their articheture and buildings, it does have similarity. Also the grubbs influence does tie in with the western theme, think about Indians and Cowboys. Another thing is the whole freedom of water based idea, American Indians are very respectful towards the enivroment like the grubbs are, so I think it makes sense that the grubbs included in game and story would have a more obvious resemblance to the old western age. And lets not forget the quotes.
The Grubbs battle armor looks like it has been inspired by Japanease samuries though.
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"For us, it's not about muscle bound characters with big guns. It's about little guys " ~ Lorne Lanning 15/02/2000 "We knew there were more of us out there, and were gunna find them!" ~ Abe
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