If Kitab Al-Kafi narrates the sayings of the Prophet (s), why do all chains of narrations stop at an Imam and not state that the Imam heard it from his father who heard it from his father all the way to the Prophet (s)?
It has been very clearly mentioned in many authentic narrations from our Infallible Imams e.g. Imam Ja'far Al-Sadiq (AS) that: My Hadeeth is the Hadeeth of my father, and it is the Hadeeth of my grand father, which is the Hadeeth of Imam Husain, which is the Hadeeth of Imam Hasan, which is the Hadeeth of Ameerul Mo'mineen, which is the Hadeeth of the Prophet (SAWA) which is the order of Allah.
(Kitab Al-Kaafi, V.1, P. 53.).
Wassalam.