ok, in the hadith, Huzoor(S.A.W) told us to follow the Holy Quran and his itrat.. which means offspring… i’m preety sure offspring doesn’t mean sunnah.. it simply means his ahle-bait..
i’ve provided imam’s lineage in the previous page starting from Hazrat Ali(A.S).. and as far as him being inafllible and divinely guided is concerned, he has the same noor as Hzarat Ali(A.S) and all other imams.. so present imam and all previous and coming imams are infallible and divinely guided in the same way as imam Ali(A.S).. now it should be easy for u to inquire about imam Ali’s(A.S) divine guidance from more knowledgeable ppl..