THE FACT ABOUT INDRA i HAVE GATHERED FROM READING SEVERAL BOOKS ON HINDU mYTHOLOGY, THE PURANAS AND SEEING THE DEVELOPMENT OF THE CULTURE IN A RATIONAL MANNER Siva was definetely not a Vedic God.THe Rudras were there in the Vedic times and it evolved into Siva. I feel that prioe to the vedic people there must have been some kind of phalic (linga worship) worship.This was nit liked by the Vedic people.In fact (I do not recollect correctly now who) Indra or one of the Vedic Devas were reerred to as sisira nasyahah meaning destroyer of lingas The Dhasha Yanja episode itself is to bring Siva into the Vedic fold and give himea shre of the Havir Vishnu as now we know was not in the Vedas.There is an indirect reference to the Vamana Avataram by the saying he measured the three worlds with his foot steps