Re: The issue of Fadak
i dont know who abbas b ali is but muhamad b abi bakr radiallahanhu was strongly implicated in the murder of uthman and along with 3 other muhammads one of his most bitter crtitics it wud be a strech to think he wud have come to the aid of uthman
Abbas b Ali was the son of Hazrat Imam Ali and flag bearer of the army of Hazrat Imam Hussain in the battle of Karbala.
About Mohd b Abi Bakr- that is your personal point of view about the history and that is fine.