Bhai Raptor lets try to find the right person for khilafat by process of elimination.
we have four options Hazrat abbu bakar, hazrat umar,hazrat usman and hazrat ali. lets look at hazrat abbu bakar first:
according to sahai bukhari The Messenger of Allah (saw) said, "Fatimah is part of me, he who angers her angers me, and he who angers me angers Allah(st)"
Sahih, Bukhari, vol 2 p 206 .
According to Hazrat Aishah, Fatimah- may Allah's peace be upon her - daughter of the Prophet, sent a message to hazrat Abu Bakr asking him for her share of the inheritance of the Messenger of Allah, but he refused to pay Fatimah anything of it. Fatimah became so angry at Abu Bakr that she left him and never spoke to him before her death.
Sahih, Bukhari, vol 3 p 39
so a person who angered allah CAN NOT be the right choice for khalifatul muslimeens.
furthermore in sahai bukhari hazrat abubakar was mentioned as " If Allah knew that Abu Bakr had such a high degree of faith, and that his faith exceeded the faith of all Muslims, Allah - praise be upon Him - would not have had to threaten him that He would spoil his work when he raised his voice above the Prophet's voice.
Sahih, Bukhari, vol 4 p 184
just imagine the eeman of a person who raises his voice above prophet's voice.
Now look at hazrat umar. he is quoted as saying
"I wish I was my family's sheep. They would have fattened me up to the maximum. When they were visited by friends, they would have killed me and roasted part of me, and made qadid (meat cut into strips and dried) from the other part of it, then they would have eaten me, and lastly, they would have relieved me with their bowle evacuation ... I wish I had been all that, rather than a human being."
Minhaj as Sunnah, Ibn Taymiyya, vol 3 p 131
Hilyat al Awliya, Ibn Abi Nuaym, vol 1 p 52
now judge yourself can a person who thinks about himself so low be a khalifatul muslaimeen.
by the way hazrat abbu bakar said the simmilar things about himself. e.g "He looked at a bird on a tree, then said, "Well done bird ... You eat the fruits, you stand on the trees and you are not accountable to anybody nor indeed can anybody punish you. I wish I was a tree by the road, and that a camel would come along and eat me. then relieve me with his bowel evacuation ... I wish that I had been all that, rather than a human being."
Tarikh, Tabari, p 41
al Riyadh al Nadira, vol 1 p 134
Kanz al Ummal, p 361
Minhaj as Sunnah, Ibn Taymiyya, vol 3 p 120
He also said, I wish that my mother had not given birth to me ... I wish I was a straw in the mud.
Tarikh, Tabari, p 41
al Riyadh al Nadira, Tatabri, vol 1 p 134
Kanz al Ummal, p 361
Minhaj as Sunnah, Ibn Taymiyya, vol 3 p 120
Hazrat umar was also responsible for Bibi Fatima's shahadat when he tried to burn her house and broke the door of her house on her.
now look at hazrat ali (a.s)
I am not going to go into many many many hadees e rasool(pbuh) that describe his character. I will just tell you a small true story about an old woman. In haroon rasheed's empire, haroon heard that there is a shia old woman who praises hazrat ali (a.s) all the time even though it was forbidden in his kingdom. he summoned her in his court and asked her if it was true that she praises ali a.s all the time? she said yes. haroon said I will give you a chance to prove me that Hazrat ALI a.s really deserves all your praise.
old women said why shouldn't i praise ali so much he was better than 1)nabi adam a.s, adam a.s was told by allah not to go near the grain of wheat but adam a.s ate the wheat anyway. but my moula never touched wheat all his life because of that. he only ate jou.
2) my moula was better then nabi ibrahim a.s because nabi ibrahim asked allah to show him just one flash of himself because his heart was not fully convinced. my moula said that if you put sun on my right hand and moon on my left hand even then i will not have any doubt about allah's presence. 3) when nabi mousa a.s was asked by allah to go and preach islam to a particular tribe the nabi said that he was afraid of his life because long time ago he had killed a member of that tribe and was afraid that now they might take the revenge and kill him too. my moula ali a.s was asked by rassol(pbuh) to sleep on his bed when he migrates to madina, next day ali a.s said that i never had such a good sleep in my life before, he wasn't afraid of the kuffars who had planned to kill rasool in his sleep. Ali a.s is the only person in whole universe who was born in KABA and died in mosque.
guess what haroon killed that old women. allah o akbar.
now i think i made the selection very easy for you. please please let us know who did you select and why.
god bless you.
wassalam