Imam Baqir was a great Sunni faqih and he is quoted more times in Sunni Hadith then Hzt Abubakr.
But his son, Imam Jaffar, was raised in a disturbing time.Abbasi rule was beginning and his uncles were rebelling and claiming headship of his family. In these times, Jaffar was less concerned with education and more with the politics of time. So at that time, ghullat took control of shiat.People like Zurarah were forging ahadith by him in kufa.
I am not a great fan of Imam Jaffar’s knowledge because he produced such jewels as
(Al-Khisal of Shaykh Sadouq, vol. 1, p. 99).
حَدَّثَنَا أَبِي رَضِيَ اللَّهُ عَنْهُ قَالَ حَدَّثَنَا أَحْمَدُ بْنُ إِدْرِيسَ قَالَ حَدَّثَنِي مُحَمَّدُ بْنُ أَحْمَدَ عَنْ مُوسَى بْنِ عُمَرَ عَنْ عَبْدِ اللَّهِ بْنِ جَبَلَةَ عَنْ حَنَانِ بْنِ سَدِيرٍ قَالَ: دَخَلْتُ عَلَى أَبِي عَبْدِ اللَّهِ ع وَ عَلَيَّ نَعْلٌ سَوْدَاءُ فَقَالَ مَا لَكَ وَ لُبْسَ نَعْلٍ سَوْدَاءَ أَ مَا عَلِمْتَ أَنَّ فِيهَا ثَلَاثَ خِصَالٍ قَالَ قُلْتُ وَ مَا هِيَ جُعِلْتُ فِدَاكَ قَالَ تُضْعِفُ الْبَصَرَ وَ تُرْخِي الذَّكَرَ وَ تُورِثُ الْهَمَّ وَ هِيَ مَعَ ذَلِكَ مِنْ لِبَاسِ الْجَبَّارِينَ عَلَيْكَ بِلُبْسِ نَعْلٍ صَفْرَاءَ فَإِنَّ فِيهَا ثَلَاثَ خِصَالٍ قَالَ قُلْتُ وَ مَا هِيَ قَالَ تُحِدُّ الْبَصَرَ وَ تَشُدُّ الذَّكَرَ وَ تَنْفِي الْهَمَّ وَ هِيَ مَعَ ذَلِكَ مِنْ لِبَاسِ الْأَنْبِيَاءِ (ع).
"… Hanan ibn Sadir went to Imam Sadiq wearing black Na'layn (a kind of shoe with no ankle strap). Imam said to him, " why did you wear black Na'layn? Do not you know that that there are three harms in wearing black Na'layn? 1. The first one is that black Na'layn decrease eyesight and vision. 2. black Na'layn decrease sexuality. 3. And cause sadness, sorrow and unhappiness. From the other side, the black Na'layn are considered as oppressor's cloths ( 'Abbasid symbol). Better to wear yellow Na'layn,they increase vision,sexuality and causes happiness.
Strange that no Imam ever produced a Hadith or fiqh book. It was their duty as a spiritual leader to produce a guideline for ummah.There could be only one reason for this. That the Imams were not the divine guidance as claimed by Shias.It leaves forged Shia Ahadith, with even donkey as narrators!
Is that narration from a shia source?
Even if the Imams themselves never complied works then how about their students? Apart from the likes of Abu Hanifah & Malik, no one else who studied with the Imams of ahle bayt compiled anything of any importance.
The latter quarter of the 12 Imams lived during the illustrious period of hadith & fiqh compilation, yet again neither they nor their students compiled anything noteworthy.
In fact I doubt the 9th, 10th & 11th Imams were scholars as the people of their time didn't study under them & their contribution is very minimal.
Kulayni, the qummi's didn't even study under the Imams of their time which is very odd as they settled to compile the weak works they authored, filled with unknowns.
If one looks at it objectionally without emotional attachment & bias then from the 9th -11th Imams you could conclude that they may have been pious sayyids but there is very little to support then being scholars let alone the divine guides to humanity.
Also the 4th Imam we know was mainly a secluded ascetic. He had knowledge but lived a secluded life. The 5th & 6th were well known & yes many took advantage of them to spread lies in their name.
I don't think the like if Abu Hanifa, malik & sufyan thawri were their inferiors or understudy's, but rather were their contemporaries & peers who were established Imams in their own right.
It begs the question, what if the Imams of ahle bayt had compiled works so we everyone would know their real views & opinions?
Its so frustrating that this never happened especially considering it was the golden age of scholarship.
Instead we are left with dubious works of characters like kulayni, qummis who didn't even study with any of the Imams of their time.
I feel the shias particularly dislike Abu hanifa as he was the 5th & 6th Imams contemporary but overtook them in terms of establishing a madhab & his fiqh became so widespread & famous. No doubt the shia are jealous of this.
Also their hatred of bukhari who compiled the most reliable work of hadith & overtook all his contemporaries including the Imams of ahle bayt of his time in the field of hadith.