So Ganapati means the Generalissimo, as it were, of the hosts who always live in Kailasa. So this is the order or the ordinance of Lord Siva. The ordinance stands for ever. After you are worshipped alone, will anybody else be worshipped. We won t worship Lord Siva or Lord Narayana without first worshipping Ganapati.
Human mind is elated and enthused by hearing stories.
Image, painting, music, idols, dance, any kind of picturesque presentation of religion and spirituality or philosophy is generally more appealing than cut and dry logic, as you know very well. So the Puranas and the Epics bring home to us the idea of the necessity to accept the power of God as the only medium by which obstacles can be removed. So, He is called Vighnesvara , the God who is not merely the Ganapati or the ruler of the hosts or Ganas, but also a Remover of all impediments on all paths. I have heard a story when I was a small boy told by a neighbour. Do not be in a hurry.