Why did the Lord give spiritual knowledge to the sun-god when he had already given it to Brahma?

From Yogesh Sangle

Why the knowledge of BG was given to Vivaswan(Sun god) as he is demigod and though knowledge was given lord Brahma @ beginning of creation? was it given for creating a new sampradaya?

Transcript

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Question from Yogesh Sangat Prabhu. Why was the knowledge of Bhagavad Gita given to Vivasvan, son god, as he is a demigod, and though knowledge was given to Lord Brahma at the beginning of creation, was it given for creating a new sampradaya? Answer, not exactly to start a new sampradaya, but to basically make the knowledge available. So yes, there is a parampara going down from Vivasvan and Vivasvan, Manavipraha, Manu and Ikshvaku.
So going down to Vivasvan, Manu and Ikshvaku, that is described as a succession. sampradaya is a system of spiritual education, the arrangement for spiritual education, in which there are successive teachers. So that spiritual knowledge has to be given to everyone and the Lord selects certain important personalities through whom he arranges for that knowledge to be disseminated to others.
So certainly one parampara is coming down through Brahmaji. So now another is coming down through Vivasvan. So it is not a new sampradaya actually speaking.
Vivasvan has to have that knowledge because he is a very important devata. So now the scriptures do not describe in detail which are all the lineages and how all the spiritual knowledge is passed on. But we do know that even the demigods like Indra and Chandra and Varuna know about the supremacy of the Supreme Lord.
They may forget it at particular times, but they all have spiritual knowledge. And so they all have got the spiritual knowledge through some sources. So what were the sources? It will be different at different times.
It is not that everything in the scriptures is always, everything that happens throughout history is a stereotype. It is not that everything can possibly be recorded in scriptures. The history, even on the material existence, would be infinite because material existence goes on eternally in cycles of creation and destruction.
So because Vivasvan plays an important role in the universal administration and the Sun also represents illumination and therefore represents knowledge. So the Sun plays an important role and therefore the Lord chooses to give him knowledge. So it is not exactly a new sampradaya.
When we talk about the four sampradayas, these four sampradayas are for Kali Yuga. There are many other sampradayas which could have been there in earlier ages and the Lord has described one particular sampradaya. So basically the point is that if we are using the word new in the sense of something different from the other four sampradayas, we have to understand that it is not new in that sense because the four sampradayas are primarily for Kali Yuga.
Spiritual knowledge is much more easily available through many many sampradayas in the earlier ages. This verse in the Padma Purana which talks about four sampradayas Kalavya, Bhavya, Utkala, Kurukshetra, Uttama these sampradayas are primarily prominent in Kali Yuga. They were existing earlier also but they are the primary sources of spiritual knowledge in Kali Yuga but earlier there were many other sampradayas and there is always some sampradaya in the sense of some disciplic lineage by which spiritual knowledge is available to people of all ages and especially to demigods in the earlier ages.
Obviously spiritual knowledge is available. So spiritual knowledge has to be made available to the important leaders of the universal management system and because Vaswananda is one of them so the Lord chose to give him that knowledge. Thank you.