the dark les paul x holy diver issue is a myth, in my experience
had it in two dark and bassy les pauls and in a brighter one
it actually sounded brighter in one of the dark les pauls than it did in the brighter les paul, and sounded better in the darkest dark one than in the other two
the black dog, in the other hand, sounds quite dark in my lp custom, and so did the diver in a gibson SG, but not in any les paul I've installed it