dest, this is an interesting journal, thanks for running it. Found myself wondering how defined your son's trading strategy is.
Has he developed a general sense of market behavior which he uses to intuit broad hypothesis and then finds a structure to express them while staying within risk limits? Such as vol is currently rich here; expect XYZ to trade around a certain range for a certain time; etc?
Or is it more pattern and data driven where he has been given or constructed some sort of model that informs decisions based off statistics. Realize it's probably not as simple as an either /or, but do you have any observations about the rationale behind his executions?