Re: The concept of being Stoned to Death
Historically, this is not the case. The Quran was compiled much earlier than the Hadith, under the Noble Caliphs.
The Quran was not compiled by Bukhari, or Muslim, etc....nor does it need any verification of it's authenticity by checking a chain of transmitters. Nor did any scholar pour over the ayats determining if each one was correct - that was done during the Prophet's life, the Quran having been compiled as a whole for the first time under Abu Bakr Siddiq (ra).
The earliest known compilation of Hadith can trace back to the first century after the Hijrah, a totally different time scale. Even then, their classifications and the way to handle them were not set...that would be done much later.
So the two do not share the same lifespan or origins.
THats not the case, hadees were written down by many Sahabas. Abdullah bin Amr bin al-As for one, used to write down what he heard from his Master. Other Companions too put their collections of Hadith into writing later in life, particularly Abu Hurayrah and Abdullah b.Abbas, two very important sources of Hadith. So these are the same people who narrated us Quran and Hadees. As far as scale for the classifications of ahadees, it was not even needed at that time, since there was no corruption and when you scale a hadees, you only go up to the tabi and not a Sahabi. Classifications were created later on when some people tried to make up fake hadees, so the muhadithoon came up with the criteris to prevent that.