Salam `Alaykum,
Answers in order of questions,
1- Abu Bakr's appointment was not pre-planned, it happened due to circumstance. Those who were present at Saqifah were major influential Muslim figures from among the Muhajirin and Ansar, they ended up making the right decision. Abu Bakr is known as the Prophet's (saw) right hand man, his best friend since before the time of Islam, a knowledgeable jurist, an intelligent leader. I firmly believe he was the most superior of all the nation after the Prophet (saw).
2- If `Ali was in Saqifah, seeing as though as opposed to Abu Bakr and `Umar, `Ali was actively seeking to assume leadership. Knowing the character of Abu Bakr and `Umar, it is very possible they would have pushed for `Ali's caliphate if he were present and if he demanded it directly. Also the Ansar would have backed off quicker. I say, thank God `Ali was not there because having an inexperienced young man lead the nation at a sensitive time would've destroyed everything the Prophet (saw) had built.
3- The Hadith of looking at his face isn't authentic, also it doesn't signify superiority or any leadership qualities. Similar virtues can be quoted for other Sahabah.
Allow me to answer while I'm at it.
"Abu Bakr's appointment was not pre-planned"
I agree to the above.
"It happened due to circumstance"
It was a coincidental decision based on unfortunate circumstances. We aren't talking about the character of Abu Bakr. That's got nothing to do with it. Just the nature and circumstances of how the whole episode unfolded.
Like I said before, it wasn't a planned or arranged public gathering, assembly or event for the purpose to choose and select a leader where all important personalities got their say and where there was a selective choice of candidates based on equality and fairness.
"Those who were present at Saqifah were major influential Muslim figures from among the Muhajirin and Ansar"
No, this is not correct and neither is it based on true historical facts.
Only the heads of the Ansaar gathered in Saqifa. Why and what for is a very important and crucial question. There were no Muhajir there. Not even one because it was just the heads of Ansaar that gathered there.
The companion I mentioned and you corrected his name got to know about it. Why just he? Nobody else had the slightest clue of Saqifa. Not even the Shaykhain. Why? If this isn't secrecy then I don't know what is.
The companion in question who happened to be a Muhajir got the attention of Umar and they found and informed Abu Bakr. All three of them quietly slipped away to Saqifa. Why? To stop something terrible from happening. No Muhajir was present at Saqifa prior to these three turning up. Not even a single Muhajir. Why?
"they ended up making the right decision"
Right decision according to whom? And who gave these three the authority and right to make such an important decision on behalf of the entire Ummah who didn't have a clue what was going on. If this isn't secrecy then I don't know what is.
Why did the three end up there? To stop the Ansaar from selecting THEIR OWN LEADER.
"Abu Bakr is known as the Prophet's (saw) right hand man"
"I firmly believe he was the most superior of all the nation after the Prophet (saw)"
You need to back this up. You need to prove this. They're just words at the moment. The same can be said about Ali or anyone else as a matter of fact.