Asking for divorce after faskh

Q: When fasakh has taken place, does the wife still need to ask the husband for a divorce or is it that because the nikah is now cancelled out they are no longer partners so therefore asking for a divorce wouldn't make sense as they are no longer spouses. How long is the iddat once fasakh has taken place?

Following a Mazhab

Q: If muqallids are those who follow imaams without understanding any daleel from Quran and sunnah.

1. Why did the students of Imam Abu Hanifa (rahimahullah) differ from Imaam in many opinions?

2. Why does the fiqh of hanafi contain rulings contradictory to the verdict of Imam Abu Hanifa (rahimahullah) such as on aqeeqah, madinah as haram, etc.

3. Who were those who nullify some statements of Imam Abu hanifa from hanafi fiqh, but still called muqallid (the one who does not understand the daleel behind the qaul of imam saheb). I have heard that in the case of difference of Imam Abu hanifa with his students, a lay man does not have the right to accept any ruling with his own mind instead a jurist of the same madhab will choose the best opinion. This concept creates three serious questions.

First - If a jurist has the ability, capacity and knowledge to select the best verdict in case of contradiction within madhab then why is he still a muqallid.

Second - If a jurist (muqallid too) has the ability to look at the Quran and hadith for selecting the best verdict within the madhab, then which Islamic law prevents him from selecting the best verdict from outside the boundary of his madhab.

Thirdly - A lay man has not been given the right to accept one out of two contradictory rulings of his madhab with his own mind, then how come he has been given the right to choose any one imam out of the four with his own mind without any knowledge.

Marital problems

Q:

1. If a husband promises his wife that he wont ever want to take another wife/wives, does he forego his right? What happens if he breaks the promise and he does a second nikaah?

2. If the first wife cant cope or bear the pain of it, can she leave him?

3. If he feels that the second nikkah was a mistake and he regrets it, can he leave her? Both wives are living in 2 different countries. He doesn't spend equal time nor equal money on both his wives. He really loves the first wife more than the second and both the wives are aware of that.

4. Also, if the husband refuses a divorce, can the wife request a khula'?

5. If yes, does it mean that the kids have to go to their father and if the husbamd demands any amount of money he wishes too, she would have to pay in order for him to agree to khula'?