Re: Munkir-e-Hadees
You are correct in what you said. But i’ll address your original question first.
The reason we believe hadith is because there is zero percent chance that anyone can understand the Quran without the hadith of the prophet. Moreover, this whole thing of narrated chains is partially correct. Like the quran that was written on leafs and small parchments, there are some hadiths that were written down as well (most have been perserved and are in museums in Jordan/Syria).
Now about this whole 200 years after thing. This is a huge misconception as most people look to Imam Bukarhi as the first compiler of hadith. He was not the first but had the biggest collection, there were people who started to compile hadith during the time of the prophet and i’m sure you can find first hand accounts in there. Moreover, Yes, chains of narrations were included but a hadith is not a hadith until it has been verified by multiple accounts, making it extremely hard to contest or even challenge.