@Ameen,
I kind of read your posts quickly and what mainly caught my eye is when a brother asked you: "Is it impossible that Fatimah (as) didn't know this?" and you replied by telling him:
I see this as more than impossible.
This is where the real bias and real sectarian extremism comes in. I do not understand what is classified as "more than impossible", I know that impossible is usually the limit of what cannot be realized but to cross this limit shows a great extreme form of bias and sectarianism.
Your argument is simply summarized in that "How can Abu Bakr be more aware than Fatimah about her own father?"
First of all, a simple argument I can use against this, is that by consensus of Shia scholars Fatimah (as) was born after five years from Bi`thah, making her age 18 when she died.
Fatimah (as) died after 5-6 months from the Prophet (saw), which means she accompanied him for less than 18 years.
If you add to this the fact that Fatimah (as) was not aware nor mature until the age of 8, this means altogether she accompanied her father less than 10 years.
As for Abu Bakr, he accompanied the Prophet (saw) and was very close to him and was his adviser and right hand man throughout all his prophet-hood, which was 23 years.
It is also stated in all narrations that Abu Bakr and the Prophet (saw) were good friends and companions before the coming of Islam, and this is why Abu Bakr embraced Islam quickly and never questioned it. For how long they knew each other before Islam is not stated as far as I know, but if we put a minimal amount we'll say 5 years.
The above leaves us with the following:
-Fatimah (as) accompanied the Prophet (saw) for less than 10 years.
-Abu Bakr accompanied the Prophet (saw) for 28 or more years.
Now the above is really unnecessary and this isn't the reason why Muslims believe Abu Bakr knew and Fatimah (as) didn't.
The argument put forth by the Shia, that Fatimah (as) had to know more since she is his daughter, this is inaccurate and faulty. A lot of a man's life long friends know more about their lives, their habits, their ideas and their beliefs than his children. In fact a lot of times, when a man dies, his children would visit their father's friends and ask them about their father and his stories and experiences.
I add, that my father's friends know more about his occupation especially his own co-workers, if my father is a famous architect it doesn't mean I know more about architecture than my father's friends who worked by his side on projects.
Thirdly, it was reported that Fatimah (as) was from the most pious of people and her father (saw) loved her a lot, but it was never reported that she was a scholar nor from the people of knowledge nor did anyone seek to learn any religion from her throughout her life. As opposed to Abu Bakr who was known for his knowledge and deep understanding of prophetic-Sunnah and rulings of Islam and gave verdicts both during the life of the Prophet (saw) and after his death.
Fourthly, the amount of time the Prophet (saw) would spend alongside Abu Bakr during the day was more than the time he would spend with his married daughter. If your father was a president or a business man, you'll know this because you'll almost never see him at home, he would spend his day in the company, running the affairs and checking the strategies and attending the meetings and conferences, and he would travel often and be occupied most of his time because of the big responsibilities. Imagine a Prophet of Allah, how much more responsibilities does he have? He has to teach the simpletons their religion, attend to the needs of an entire nation, teach monotheism, debate deviants and pagans, plan wars strategies and alliances, teach Qur'anic recitation and Tafseer, offer wisdom to people, spend each night at the house of one of his wives, attend meetings with tribal leaders from all over the Arabian peninsula, participate personally in many battles, attend the five daily prayers at the Masjid and pray the voluntary prayers during the day and he used to pray much during the night etc... And who was by his side when he did all of this? His close companion and adviser Abu Bakr, not Fatimah (as) who was in her own house.
These four points are sufficient for now.