Four roles, but not necessarily four people. Four has never been a significant number in ES, unlike three.
What is important is the observer. The TES world makes FLAGRANT use of superposition. Superposition is decomposed when observed. The witness does the observing, the act of which decomposes the waveform.
EG-- Superman and Klark Kent are both the same being. The form that Superman/Klark is in cannot be both at once, but logically it is so. This seperation is performed by the observer, who sees either Klark Kent, or Superman in his superman outfit.
The Enentiomorph between EG--- Auniel and Lorkhan-- is decomposed by the witnesses-- Which is why now you have Men and Mer, and the like. The consequences of variable fate being measured by an observer. The observer witnesses the superposition being decomposed, and often times cannot handle the mental stress this causes.