Nature = essence = ouisa.
When discussing the Hypostatic Union of Christ, we see two natures united in one person.
When discussing the Trinity, we see one nature fully present in all three persons.
In either case, it is the nature, not the person, that is responsible for the action - thus, this is why Jesus has TWO wills, and not ONE. This was THE deciding factor regarding the orthodox battle vs. those Jacobites and such who thought Christ had only one will.
Thus, my problem with an energy that is God but that doesn't also include the essence. God is simple (no parts)
Regards
Ah...
Thank you.