Because you are saying that excessive spirit causes elementals to turn into flesh and bone "organics". Nothing you have provided indicates that because it wasn't the spirit on Dreanor that created Grond. It was a Titan. Elemental energy is not the same thing as an elemental. Azeroth is still full of elemental energy even though the elementals were locked up in a prison.
The lore, page 12, that you provide proves the opposite. That excessive spirit actually causes them to lose form and turn into "ghosts". The opposite of flesh and blood. Lmao.