What we have taken constant here is the processing of the inputs, with wide variety of inputs available to the brain, its processing power would get better over a period of time and hence the decisions it would make would be much better and evaluated, ultimately leading to better and better decision.
So there could be a moment when the input itself, is the output. The input itself becomes as good as the output. There is no processing involved.
The decision taken in that moment would be Free Will?