"It really isn't a question of "Who says..""
You said it, in fact.
We seem to be engaged in a conversation in which you are stuck in the SUBJECTIVE WORLD which is in no way different from the IMAGINARY.
That's certainly an interesting viewpoint, but subjective opinions often interject into reality. That's why we have different flavors of ice cream. I subjectively prefer vanilla bean, but my friend subjectively prefers chocolate. Two subjective opinions that have a very real effect (manufacturers making different flavors).
I'm arguing from OBJECTIVE commonality which is to say MUST HAVE PRACTICAL APPLICATION in the same world we all share.
That's not what objective means.
"No, let's get you to acknowledge that anything you think you think is neither FREE nor WILL until it meets the test of objectivity outside your mind in behavior which demonstrates its existence."
Why would I agree to acknowledge that? It doesn't meet the definition of free will and layers on criteria of free will that you made, i.e., test of objectivity. The marathon example perfectly illustrates how free will can be used and never accomplish the goal the free will decided up, which is to say that exercising and using free will does not imply achievement of the end result.
Otherwise, a man who thinks he is Napoleon is as valid to you as the actual Napoleon thinking about his own identity.
Her certainly is free to think it. I am under no obligation to agree with him. Why would you suggest that? Let's go back to the marathon example. I might think i can run a marathon. You disagree. We have both exercised free will.