Islam Critiqued is now a hadith scientist; no isnad for Zayd sources?

In answer to the video "Miraculous Preservation of the Quran: Burying the Myth"

The Quran was transmitted, learned and passed down both verbally and in script form, on a scale never seen for any document, let alone religious. Any unbiased individual can see this is a process which is still continuing today. But the primary source of transmission was always oral. All written texts were dependent on it and it still is the case today as all written texts must be attested by the oral tradition of transmission through a Hafiz. Again, this simply is a statement of fact. Writing down was only meant to consolidate the process of oral preservation.

This is what the novices to Islam, which is the case of most of its self-proclaimed critics, fail to grasp. They approach Quran authenticity with their own scriptural history in mind, thinking that the Quran was put to writing out of thin air. This dual method of control, textual but mainly oral, which was never practiced by the transmitters of the Bible, made it impossible for any tampering as it would immediately be detected by the thousands of memorizers in all corners of the Muslim territories. The number of people having transmitted the Quran is so vast that any error in the transmission, textual or oral, became impossible. This is why the Quran is labelled "mutawattir", a level of authenticity attributed to an oral transmission when it has been related exactly the same way by countless independant sources.

Extremely few ahadith have been labelled as such or reached the level of multiple independant sources as the Quran.

Most ahadith are based ahad reports or singular transmissions.

Further and in contrast to the Quran, the ahadith require isnad (detailed chain of transmission) to be validated, because the earliest communities often disputed and argued about the veracity of these statements. The Quran never required any isnad to gain a sense of credibility and authenticity because the text and veracity of the Quran was agreed to by a consensus of the earliest Islamic communities. Despite the abundance of 1st-2nd century hijra manuscripts, there is zero proof that the Quran was transmitted in anyway other than tawatur. Hence the position of mainstream academia as regards the authenticity of the Islamic narrative of compilation, preservation, transmission of the text and recitals. See further below.