User blog comment:Seal To End All/Salty Seal ; WHY IS THERE SO MUCH OVERSUPPORT - Dragon World/@comment-6218208-20140328025150/@comment-1755882-20140330160959

Yeah, you could, but due to how Dragoenergy and Knightenergy work, doing so hurts your defenses a lot. Not to mention many powerful Armordragons and Dragon Knights require cards of the same Attribute, so teching in others will, again, hurt your consistency.