when I said 3 I meant the 3 caliphs not accepted by shias..Imam Ali I believe shld have been CALIPH/IMAM/AMIR number 1!
I do not attach infallibility to them as I mentioned I do not attach the baggage of imamate to them as do the Itna Ashariyya but I can see why they do attach it 2 them (quran 33v33) I believe, as for Caliph Number 3 I believe he was politically weak, and commited nepotisim something which ultimatly led to his downfall