Clarification that the Qur'an and the Sunnah share a single source and the difference between them

The Shaykh : Thus, all of this makes it easier for the researcher not to be surprised or troubled by the abrogation of the Qur'an by the Sunnah; rather, it facilitates for him to adopt this idea and this belief. This is especially so if he remembers that both the Qur'an and the authentic Sunnah emanate from a single source. The only thing is that the degree of certainty differs: the Qur'an is mass-transmitted, while the hadith is not mass-transmitted. However, this difference in the degree of certainty is not sufficient to be a justification for rejecting the statement of those who say—welcome, greetings—that it is not permissible to abrogate the Qur'an by the Sunnah. This is because we find that many scholars abrogate, as we mentioned, a part of a verse that is certain in its authenticity with a solitary report. Therefore, this disparity in the degree of certainty should not be an obstacle in the path of accepting the statement of one who says: it is permissible to abrogate the Qur'an by the Sunnah.
This is all I have regarding the previous question.