I suppose my question is: How do you know this? Alexander was surrounded by hand-picked men his father had groomed for decades in some cases. Offering council on every part of war fighting, from tactics to strategy to logistics. Isn't it entirely possible Alexander simply went with the flow of wiser, more experienced men telling him what to do?
Earlier in the article the author mentions alexander's perfect track record of logistical balancing. Surely that, if nothing else, is far better attributed to his officer corps then him? They'd been doing this successfully for 20 years before he took over, they had lots of practice at it and all Alexander had to do was not upset the apple cart.
Or another example - one man cannot organize a cavalry detachment mid-battle and send it to aid a failing flank. That takes the work of many dozens of officers, and well trained soldiers drilled to follow orders even under intense stress.
Of course this is all speculation on my part, as we simply can't know due to the mythologizing of the man and his life. But it's a question I find interesting to ponder.