Hello everyone,
greetings and yes, very nice topic for discussion.
However, it would be better if people realised what hadith really is and what purpose it ought to serve and how it has been categorised and why?
It is a fact that none of the hadith are accepted authentic by muslim ummah as a whole. For example, sunnis reject the shia collection eg Al-Kafi etc and the shias reject the sunni collections eg bukhari, muslim, tirmizi, ibn maja, abu dawud, nisaee etc etc. The quran only muslims reject all the collections by either of them. The question is, why?
It seems that there is no proof that hadith are authentic and the reason is the conflciting principles on which the hadith are judged for their authenticity. For example, on one hand the rule is that if the narrators are good then the ahadith they narrate must also be good. This rule is then set against the rule that if any hadith is found against the quran, it is not acceptable. This rule does not work because if you accept narrators authentic then you cannot afford to reject them. However, if you do reject the narrators on the basis of the quran then whatever they narrate becomes suspicious and so loses its authenticity. So the rules by hadith collectors themselves do not work out when put to the test. Now if rules do not work then whatever is based upon those rules cannot be acepted authentic either. This is why, it is not possible to prove any hadith authentic no matter what. So categories do not matter at all.
If the quran is accepted authentic then anything against the quran has to be false. So if anyone tells that prophet said or did this or that which is against the quran that person would be proven unrelaible. Once a person is proven unreiable, there is no way that one could then accept the unreliable person's other narrations and so the whole hadith literature falls under suspicion that is judged on the basis of such like rules. You either accept a testimony on the basis of self evident facts and logic or you do not.
Just for the benefit of the readers, the hadith are categorised mainly on the basis of isnaad=chain of narrators and the text=matan. Some hadith have one but others multiple chains as well as some are well known others not so well known.
Any chain of narrators is either complete or incomplete between the alleged witness who says he heard or saw the prophet say or do something and the collector of the hadith in form of the book eg bukhari. The chain could be broken at either end or the middle and could even be broken in more than one places. Likewise the text reported may be complete or incomplete, clear or confused. So the sahih hadith is said to be that which has reliable chain of witnesses as well as clear text and is not against the quran or illogical and or against self evident facts. All other categories of hadith are defective in some way or another. However, if a hadith is reported by more than one chain of narrators then it is only re-enforced provided it has been reported by at least one reliable chain.
Thus hadith are said to be khabray wahid=single chain and not well known, mash-hoor= single chain or multiple chains and well known, matwater= many chains and very well known. Such categories of hadith are based on number of chains as well as how well they are known.
Likewise we have sahih, ahsan,zaieef categories due to text being clear or not or defective chain. The chain is categorised as murfu, maroof, muttasil, mun-qata, etc etc. Mozoo are such ahadith as are thought to be made up.
I hope this explanation helps move discusion forward.
Regards and all the best.