Upcoming No Confidence Vote Presents More Questions

Last night Kachol Lavan threatened to support the next "constructive" no confidence vote that will be submitted by Yesh Atid and will present Moshe Boogie Yaalon as its candidate for Prime Minister. If kachol Lavan supports Yaalon, this would have a chance to bring the government down and replace it with a new coalition.
I am not even sure what the threat is for. The budget fight? The anger over the snubbing in the peace deal and hiding the arms deal aspect of it until now? Whatever. 
Naftali Bennett later said that he will not support the no confidence motion, especially as it would have to be together with the United RAab List for it to be successful, but also because he is not willing to replace a treifa (Netanyahu) with a neveila (either Yaalon or a government supported by the UAL, not sure what exactly he meant).
While Netanyahu and the Likdu expressed insult at being called a treifa by Bennett, I don't understand what is happening.
1. Bennett leads the opposition party that garners the most mandates in recent polls, so why would the no confidence vote not post Bennett as its candidate for Prime Minister? 
2. Why would Yesh Atid put Yaalon as its candidate rather than Yair Lapid who heads the party, and the largest faction of the joint list?
3. Lapid himself has said he would no longer be under anyone else in the party, after Gantz abandoned the joint list and went into the unity government with Netanyahu, yet now he is propping up Yaalon.
4. If Bennett supported a recent no confidence vote that had Lapid at the head of the proposed coalition, why would he not support one that has Yaalon at the head? Why is he any worse than Lapid? if anything Yaalon's right wing credentials are far better and should be more palatable to Bennett than Lapid's... 
5. If Bennett's goal is just to get rid of Netanyahu, why not support Yaalon as he did recently support Lapid, if it would be feasible to be successful?
6. If Lapid's goal is just to get rid of Netanyahu and that's why he is willing to put Yaalon up as a candidate instead of himself, why not make a deal with Yamina to put Bennett up as the candidate and thus have better chances of success?
 
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