Re: How to pray witr?
And I think you are aware that unlike the Shaafi fiqh - the founder of which actually wrote an entire book on his Usool known as Al-Risalah - there are no - absolute none, zilch - works on Usool from the founders of the school, namely Imam Abu Hanifah, Abu Yusuf, and Muhammad.
Rather, it was later scholars of the Hanafi Fiqh who had to take the fiqh of these and then develop the Usool from it.
Which leads to the question as to what the mindset of these later scholars was when developing the Usool. Since Karkhi explicitly stated in his Usool that any Verse of the Qur’aan or Hadith which goes against the verdicts of our Companions (Imam Abu Hanifah, Abu Yusuf, and Muhammad) will be given an interpretation to fit their verdicts or considered abrogated.
And when you look how the Hanafis choose to rebut, if you will, the other schools of thought in a given issue, you will see this rule in play as they more often than not always resort to the answer that this has been abrogated.