You are writing: "Ali, r.a., wanting to go to Abu Talib, a kafir, to seek advice on faith, showed that he was not an independent thinker, but Allah blessed Ali to accept faith later that night."
How old was Ali at the time? Wasn't Ali about 10 years of age or so? He was a child, isn't it? On the other hand, how old was the Abu Bakr? Are you not comparing apples and oranges? Please before you infer something take a pause and reflect.