When drawing Staldorf, I realized how similar he was to Grand Emperor Ganon. The flowing robe (that's barely different in form, only blue instead of red), the same trident, a relatively similar stature—yes, they are related. But they are simply concepts and weren't intended to be a pair of forms to fight in a hypothetical game. In fact, Staldorf never had much of a backing concept other than, "a skeletal Ganondorf", as proposed by a friend on Smashboards however long ago that was (two years?).
Good eye though!