Hmm. A ruler is usually a saint of some sort, but the true requirement is a sense of impartiality and a lack of a desire for the Holy Grail. Ol George was impartial in the context of American internal politics (and only to a point, given he was in favor of the centralizing 1787 Constitutional Convention from the beginning), but outside of that, he favored Britain in foreign affairs over France, continued the settlement of the west at the expense of Native Americans, and overall favored the interests of the United States above all else. Which, well, he was the first president of the US, and actively fought for American independence, of course he would. (Washington was also profoundly racist, as to be expected of an 18th century plantation owner.) Whether Washington would prove to be an impartial overseer in the context of the HGW, or whether he would seek the Grail for himself, is an open question. I could see him potentially seeking a wish to ensure American peace and power forevermore, for example. He could be a Ruler candidate, but he could also not be.
