I had a question on the life of our esteemed 6th Imam, Jafar al Sadiq A.S.

I have read that the four major ahle sunnat schools of thought had leaders who were students of our beloved Imam. I wanted to confirm my knowledge with the correct sources. If you could please share your knowledge on this, would be so grateful

It is well known that Imam al-Sadiq (as) had thousands of students. Thus, it makes sense that many were not Shia or followers of Ahl al-Bayt. Moreover, because our Imam was teaching foundational concepts of Islam (kalam, hadith, seerah), many flocked to him to learn. Thus, it is accepted that he taught Abu Hanifa and Malik ibn Anas; Hanbal and al-Shafii came a little later. There are many Sunni and Shia sources that point to these details.

Some information can be found here (please note, I am not endorsing this site, but the basic information here shows want is known):