This is something that's been bouncing around my head for some time, and I'd like your take on it. Firstly, why do the BoS never use T-51b, and secondly where did all this T-45d come from?
My questions were sparked by the Pitt expansion, where we find that the Brotherhood used T-45d during their mission there. The mission was done on the way to DC, which suggests Lyons and his detachment were packing T-45d from the offset. This doesn't make sense, however, as all the Brotherhood Paladins on the west coast (and in Mojave for that matter) use T-51b as standard.
So, what are your theories as to why we never see T-51b used by the Brotherhood in Fallout 3?