Jamaat Salaah and Imaamat

Q: A married person who is secretly in contact with another unmarried woman but he is an Imam of a masjid also, Salaah performed behind him is valid or not?

Q: How will a Hanafi muqtadi follow a shaafi or hambali etc in their witr salaah?

Q: If musallees walk out of jamaat salaah just because they think the Imaam is arrogant and they have issues with him, is this correct? Some who feel the same still pray in the masjid behind him but then go home and repeat it. Is this correct? 

Q:

1. If a person is a Haafiz, is it permissible for him to recite the Qur'an in front of everybody without a topi?

2. Can he lead the namaaz?

Q: What are the prayer and other sharia rules concerning a person born out of wedlock. If he can't inherit from his father and can't lead a jamaat in prayer then why must he himself read prayer or fast?

Q: For whatever reason which Allah (Ta'ala) knows best I woke up for fajr salaah a bit later than usuall i.e. within permissible time but not enough to make it to the masjid as I felt I could miss the Jamaah and fall within an impermissible tome. I commenced with salaah and performed a short but not hesty salaah with Jamaah at home. I had completed salaah and tasbih* and dua by 04:35am- 20/12/2015-durban. Latest Jamaat commencment time in locality is at 04:25 (Masjid is Al-Hilal)- did my salaah fall within the permissible time and was my decision to perform salaah at home with jamaat at home valid on grounds that I could have missed salaah and permissible time completely had I driven to the masjid. Note that we follow the Shafi'i Madhab so the duration of salaah included dua e qunoot which was incumbent on me as the imam leading salaah.

Q: When performing Salaah behind an Imaam, what should one recite in the standing posture? Will one have to recite Surah Faatiha and a Surah?

Q: Will the salaah performed behind an Imaam who wears his trousers below his ankles be valid?

Q: Can a person wearing a urine bag lead the Salaah?

Q: I have lead a congregation with no wudu intentionally. I cannot inform the people because it was on a holiday when I was overseas. What must I do? Will Allah forgive me?