Karthus' VU for his other skins don't make sense

With karthus' VU and the pentakill splash update, that seems to be the focal skin. His other skins were visually updated, but the themes behind it were completely ignored. Statue of Karthus skin is perhaps the worst skin to own right now. Once a comical skin, now in game it has a darker presence to it. Ontop of which, because of the new VU, this skin doesn't HOLD THE TABLET like the splash or the actual statue does. Phantom Karthus VU, by far, is the best one imo. But its lost its "phantom of the Opera" flair, and might as well be another skin. It literally, looks nothing like its update. I sincerely dislike his new dance as well. It barely makes sense except in the pentakill skin, and that might be the only skin I don't own (Because I don't think its a good skin). But now his whole character revolves around it? It honestly feels like his VU is beautiful, but clearly forgot about his other skins.