Salaah with mazi on ones clothing

Q: Yesterday, when I went to toilet, I found stains of pre-cum (mazi) [I have this problem that often it comes out unintentionally). The stain was very small, probably smaller than a drop of water. Nevertheless, as I was in a hurry to join the Asr Salah in jamah, I forgot to change my underwear and even forgot to wash the stain. In this condition I prayer the Asr, Mugrib, Esha and todays Fajr Salah before recalling the incident. Now my question is should I repeat the four Salah prayed in the above mentioned condition or was my Salah valid. Can you also advise me on what to do for the problem of the mazi coming out.

Imaam breaking his wudhu

Q: If the Imaam breaks his wudhu during leading prayer, I know he can appoint another to be imaam, but is it also aloud that the jamaat does continue each individually their salaah ? Also, if the imaam is just leading 1 person, what is the situation then?

Continuity in the saffs

Q: What is the masaalah in regards to making Iqtidaa of a jamaat which is situated in a building disconnected by a distance of about 50 meters or so? ( a separate building) for eg.. a female jamaat making iqtidaa of the main jamaat in another building etc... on this point if Mufti Saheb could please discuss the situation in the haram when salaah is performed on the roads in saffs which are disconnected.

Reciting the Tasbeehaat of Salaah is such a way that one can hear himself

Q: I have a question with regards to method of performing salaah. If one is performing salaah, whether alone or in jamaah, should the person recite his tasbeehat in a manner that the next person can audibly hear what he is reading or should the brother read it softly so that the next brother cannot hear what the brother is reading.