This comparison with the Godai is only a metaphor and not to be taken too literally. It is a model of consciousness, a way to understand the program.
Like the gears of a car, you need to change between the elements as the need arises.
It is a mistake to think "I'll be fire and beat everyone that way". Every karate "master" who was taken to the mat and choked out by a Gracie found out the folly of this approach. You need to have all 4 elements.
But the final goal is to be a White Tiger not a representative of WTMA.
A Tatsujin - a Human Being, not a Human Doing. I've been writing about this a lot recently.
The goal is to be Void - the neutral gear. Eventually you will be like an Automatic - the gear changes will hapen beneath the surface without any conscious effort from you.
THIS is where you want to be.
DO NOT pick a single element and try to be just that or you will be destined to fail. You will have limited yourself to a structure. The Truth is liberation from all structure.
Having no way as way, having no limitation as limitation.
In combat there is balance between the elements.
Compare a contest between fire and water.
If there is enough fire it will boil the water out of existance.
If there is enough water it will put the fire out.
Of course by adapting you can also overcome.
Water cannot dilute water.
Again, these are metephors, not to be taken too literally.