Maiar in physical form

[Potatothan]

except for maybe a white/light light blue or red almost translucent flame.

Well could the flaming eye be a mix of his spiritual form and his translucent flame form? (just giving it a name, so sue me) Since he was building up his body again. But why would he stay as the great eye? He didn't need the ring to get his body back. I mean we aren't talking something lame as Voldemort here. So why didn't he take physical form yet? If he had the strength to rebuild Barad-Dur and an army great enough to conquer Middle-Earth, why not make a body?

~Potatothan