Yeah I totally forgot about Whistler. Just to touch on what the ladies said, I didn't mean that why didn't Buffy work for the Powers, it was more like why weren't they ever considered as a resource? There were times especially during seasons 5 and 7 where they were really scrapping the barrel help wise that I thought it would have made sense for the Powers to at least be suggested.
Also now that I think of it, did the Powers actually intend to work and help Buffy originally? They sent Whistler to Angel to show him his 'destiny' i.e. Buffy. Whistler told Buffy in Becoming part 1 that what happened with her and Angel wasn't supposed to have happened, Angel was to have done in Acthla not activated him.