samneanderthal, why don't you write down all your theories. (maximise the defense/offence capabilities of the fighting forces). Then try to fill it in: where do I put my best leaders? (they can only be at one place), how do I divide my fighter planes, bombers (you don't have enough),etc. Then put yourself in the position of the enemy and look for the weaknesses. You'll find plenty.
There is no such thing as a perfect defense/offence. If you strenghten one place another will weaken. You must make choices. And no leaders were incompetent. All of them had advantages and disadvantages.
Churchill was not incompetent. He gave his people hope, do you know what that is to people who think it is all over?