The point is this , It is far easier to follow some else guide lines and plans than to " Guess " it your self , plus you get a viable objective opinion on where you stand rather than self assessment.
I have done the nutrition and medicinal planning for hundreds of champions and they all know the basis of competitive nutrition but they come to me as I hold a neutral outlook on there status and because of this can adopt a this is what we need to do attitude to be in your best shape possible , plus as a qualified nutritionist I can calorie count to last calorie, so all that is needed by the athlete is to do as he/she is told , and this is one less thing they have to worry about whilst getting ready.
I mean Lee knows it all as he being doing this for a long time but he still runs everthing by me for a second opinion and I tweak things here and there as I feel fit ( weather he sticks to it is another story) but the initial point is it is better just to do as you are told rather than try and guess it yourself , but be carefull who you get advice off , because in this industry every one is a expert , you ever notice that !!!