Thank you very much for taking out time and helping me with your detailed and satisfactory reply. Thank you very much for assuming my follow-up question and answering that too.
1.Do you mean that those Ahadith that are narrated by Imam Jafar Sadiq are sahih provided they are neither against the Quran nor defaming any of the Companions?
2.How and why Banu-Umayyah stopped people from narrating from Imam Jafar Sadiq and Imam Baqir? At this time I have a very soft and positive corner for Banu-Umayyah. I am not very much impressed by or attracted towards Banu-Abbas. So, please, help correct my line of reasoning if I am wrong.
3.At the time of the Prophet PBUH, Banu-Hashim was governing all kinds of political issues. How and why they were sidelined and Banu-Umayyah and then Banu-Abbas took the reign?