New Gatekeeper Galio

The new Gatekeeper Galio looks cool but why doesnt he have more interactions with skins like Demon Vi? And maybe Underworld Twisted Fate? They used to have conection: that symbol on Galio's splash was the same and UW TF's ult. Skins that I think should have an interaction: Demon Vi, Underworld Twisted Fate, Undeworld WuKong, Zombie Ryze, Reaper Soraka, Soulstealer Vayne, Soulstealer Vladimir and Undertaker Yorick. Btw why are there no "underworld/undead" skins for Champions from Demacia? :P