The point is that a sports star, mathematician, rock star, etc, does not choose their physical makeup, body or brain, that it is their non chosen physical makeup, neural architecture, muscles, physique, inherent talents, drive/will that open possibilities for them but not others.
The MYTH you're promoting is that being subject to prior causes means we are not "true" causes ourselves. You're suggesting that our prior causes must be the "true" causes. But this test cannot be passed by any of our prior causes, because all of our prior causes also have prior causes. You end up with the absurdity that there are no "true" causes anywhere. You destroy the notion of causation.
We only care about causes that are meaningful and relevant, causes which enable us to control events. Do we want to play the piano well? Then we must make it a habit to practice every day. If we are "willing" to practice every day, then we will improve our skills.
Causes over which we have no control are irrelevant to us. So, scientists and engineers develop large colliders that let us control the protons, speed them up, and crash them into other particles, to see what is inside.
But there is no controlling causation itself, because it is not an entity that exercises any control. The protons exist. The electromagnetic forces generated within the collider exist. And, of course, we exist. We were the causes that brought the collider into existence.
The prior causes of us are not the true causes of the collider. The scientists and the engineers who imagined the possibility of such a machine, and decided they would build it, and convinced others to fund the project, and designed it in detail, and constructed it, these were the true causes of the collider.
Options that are open for someone, but not for everyone, sometimes only for the very few, and in relation to determinism, not only open but necessitated....it cannot be otherwise.
This other MYTH, that things must be otherwise in order for them to be what they are, is absurd on its face. Things need only to be exactly as they are in order to be exactly as they are. So, how, exactly were things.
The scientists and engineers imagined, designed, and chose to construct the collider. They are the meaningful and relevant causes of the collider.
Causation did not imagine, design, or construct the collider. Causation is neither an object nor a force. Only the actual objects and forces that make up the physical universe can be said to cause events. We happen to be true objects and we are able to exert force upon other objects, like when we build a collider or when we use the collider to bump a couple of protons into each other to see what happens.
The notion of causation is something we use to describe the orderly sequence of events:
(1) We are curious what protons are made of.
(2) We wonder how we might see inside.
(3) We imagine speeding up protons and colliding them into each other.
(4) We imagine different kinds of colliders.
(5) We evaluate which design is likely to work best.
(6) We decide we
will build a specific collider.
(7) That chosen intent then motivates and directs our behavior as we take steps to raise money, create blueprints, build, test, and operate the collider in order to satisfy that original curiosity that existed within us, and which could not exist in any inanimate object or non-intelligent species.
In summary, we were the original source of the notion of a collider, which we set our sights (our will) upon building.
So, again, where does this thing we call free will come into the picture as a real attribute that makes a difference?
The freely chosen "I will" is right there in front of us. We imagined ways to break open a proton to see what's inside. Some of these ways were likely impossible, and were eliminated at the outset. But some of them were real possibilities, things that we could do, if we chose to, like a linear accelerator or a ring accelerator. Different science teams selected different designs, according to their own needs. In each case, the driving force was a freely chosen will, a will that sustained their activity as they proceeded through the steps necessary to actualize their freely chosen option.
Had they decided not to bother, then there would be no colliders. Their choices were the meaningful and relevant causes of the colliders.