That is very indepth. I would advise not to over think the matter and keep it simple. The point to where I could a pure ice/ magma elemental come into play would be something like aqua or pyro's progeny. Which at this point isn't much in the cards. If this lasts a long time I could definatly see them becoming relevant. For the time, I would think sticking to the basics would be the wisest thing to do.