At that moment, Yale knew that there weren't too many more Minor Divinities that he could obtain.
It wouldn't be impossible to obtain some element derivate of the ones he obtained or trying to obtain the Minor Scythe Divinity. Still, Yale felt that it would be a waste of time because he noticed that Minor Elemental Divinity was far better than any element on its own, which turned the elements in boosts that weren't worthy of spending millions of tries on developing.
The same happened with the Minor Battle Divinity and the weapons. This last one really boosted everything related to battle, but having that one turned the Minor Divinities for weapons just a little boost, which was even worse than the one produced by the elements.