This is my opinion:
If "we" dosent know what the concept Zeus represents (in-verse), well...., it has to take it away from him until he demonstrates it or is explicitly mentioned by multiple sources or one very reliable and good. If it is speculative then you should not take it, even if it is a "possibility".
Now, if he manipulates, creates, destroys, alters, etc, concepts, need the proof of that, if is because he is a deity he scales to others who has shown it, said feats have to be republished and analyzed for its validity or not.
On the subject that what is canon and dosent, that is its own completely separate subject (even if this influences a lot for the work either in lore, skills, development, whether or not it contradicts current, past or future material, etc.).