" Imam Shafi said that i read the book of Mohamad Bin hassan Ahl ur Rayi.Everything in that book was wrong except Bismillah and i threw that book away" (Adab Al-Shafi'i)
Sheikh Ul Islam Ibn taymiyya ra has also refuted the claim that Imam shafi studied under Mohamad Bin hassan Al shaibani in minhaj us sunnah and Imam Dhahabi in Al mintiqaa
What about Imam Nasai ra?