What was the purpose of Shukla Yajurveda when the Krishna Yajurveda was already present? Inviting answer from Any Vedic scholar on any references to the purpose. Sun instructed that to Ygnyavalkya.
I was able to find an answer ( sort of unconvincing, but will take it as is) here. https://vedicheritage.gov.in/samhitas/yajurveda/
With Help from this thread https://www.tamilbrahmins.com/threads/what-was-the-real-purpose-of-shukla-yajurveda.52090/
No real purpose as per this post. It just so happened..
"The Shukla Yajurveda is related with the Aditya-school and the Krishna Yajurveda is related with the Brahma-school. In the beginning of his commentary on the Shukla-Yajurveda Samhita, a story is given by Mahidhara, about the two-fold division of the Yajurveda. Rishi Vaishampayana taught the Yajurveda to Rishi Yajyavalkya and other pupils. Once Vaishampayana got angry with Yajyavalkya and asked him to give back what he had learnt. Yajyavalkya vomited the Veda by the power of Yoga, while the other pupils at the command of his teacher swallowed up the Yajush thus vomited, assuming the form of birds called Tittiri. Thus, the Yajush became dark and was named Kishna or Taittiriya. Then Yajyavalkya prayed to the Sun, who came to him in the form of a horse i.e. Vaji ) and gave him back the Yajush. Hence this Yajurveda was named Shukla or Vajasaneyi."
People may wonder how people turn into birds..There are many Indian stories on Shape Shifting. All of them involve some curse or the other and hence is associated with 'Dark'.