Perhaps, but Aka is special- the first Aedroth, and the first Idea that refused to die. Note that his sphere encompasses (or even transcends) all of creation, which cannot be said of the others.
I think it's also moot whether the other Aedra are identical with their spheres. The Aedra who were subsumed and became the Earth Bones seem to be of a different (lesser) order- the 'concept' Aedra are stuck somewhere in-between. Plus, who would want to break the others, aside from Arkay? Actually, I think Arkay would have been broken by now if it were possible.
I'm looking forward to some more mannish lore in Skyrim- perhaps some of these issues will be clearer when we have a strong, non-imperial perspective.