Who throws the dice for you?

[Ryantology]

Suppose that ancient Greeks had discovered that lightening could not be the result of local physical causes. Such a finding would be evidence supporting the Zeus hypothesis.

First, you said that it's not a 'god in the gaps' argument, and then as an example of how it's not, you offer a sample 'god in the gaps' argument. Secondly, it's not even correct methodology. Competing hypotheses aren't given automatic boosts of credibility simply because one hypothesis fails. In your scenario, you have one hypothesis which has apparently failed testing, and one which is of no value because it cannot be tested.