Following an imaam who makes masah over cotton socks

Q: I have a situation where in my work place in Saudi Arabia (far from any musjid in construction site), the person that often is imaam of the small musallah we perform zohr and asr salah, makes masah over his normal cotton socks when he makes wudu. 

I read salah for few months behind him and only found out about this recently. 

He confirmed that some scholars in Saudi passed a fatwa that its permissible. It would seem that many of the general public here follow this fatwa. 

I do not want to argue and create fitnah based on the situation. I know the fatwa is that wudu is not valid if masah is made over normal cotton socks based on majority opinion. 

However, based on my situation/ the fact that I did not know or could not control the imaam, is my previous salah valid or should I repeat it? 

Also, going forward, what should I do: Can I read salah behind him, based on the fact that I cannot control the imaam - perhaps consider him a different madhhab/ different opinion with salah being valid Insha Allah or is salah invalid for sure in which case. Should I read salah behind him and repeat it or should I try to avoid and read on my own. This will result in me not being able to make salah in jamaat at work and possibly create division. (Also reading salah and repeating is a challenge especially asr based on limited time and people observing you).

Faskh of nikaah

Q: In shariah law there is a system called Faskh e Nikah which allows a woman who is abused in a marital relationship and has legitimate reasons to end the marriage can do so through a judicial decree without consent of her husband. 

I would like to know is this system proven from Quran, Sunnah and Hadith? 

Secondly, what are the legitimate reasons that will allow a Muslim woman to exercise her right to annul the marriage through this system ?

Using cosmetics with haraam ingredients

Q: If cosmetic items and creams contain an ingredient that is derived from the meat of an animal that is haraam (either not slaughtered according to Shariah or from any haraam animal), is this cream impure and will it render the person using it impure (impure in the sense that one cannot read Salaah, Quraan etc.). 

When it comes to the cream, it is only applied to the skin.