Yes, good point:
Recently I listened to a lecture given by Manly P Hall, in the lecture Manly talked about the elements and how they relate to the kingdoms, when he talked about them, he seemed to indicate that the elements relate to the idiosyncrasies of each kingdom rather than every aspect of each kingdom as a whole. For example, Manly said that when looking at the humanoid kingdom we see that there is a significant psychological shift in comparison to the other kingdoms, humans have intellect, reasoning, logic etc so because of this, the humanoid is said to be highly influenced by the element of air, at least in its development or elaboration.
In the lecture, Manly related only the elements of fire and air to the animal and humanoid kingdoms, the other two; earth and water he just gave a description of their characteristics, such as water being fluid and dynamic whereas earth being solid and rigid.
My question is about whether the four elements each have a role to play (semi-separately) in the differences between each kingdom. Did this clarify for you the nature of my question?