Jamaat Salaah and Imaamat

Covid positive person attending the musjid

Q:

1. If one is diagnosed with Covid, should he isolate and read his salaah at home, or should he go to the masjid if he is affected mildly (i.e. body strength, very light cough, and fever, minor difficulty in breathing, etc.)?

2. If a person who is Covid positive and goes to the masjid and the other musallis are aware that he is positive, will he then be sinful for inconveniencing Muslim brothers as unfortunately not everyone is comfortable being around the sick these days?

Filling the gap in the saff if the muqtadi leaves during salaah

Q: There is a rule in Bahishti Zewar that it is makrooh to stand alone in a row. The person should pull a person back from the row before him. What happens to the gap formed by the exiting of the said muqtadi to fill the previous row?

If a Muqtadis wudhu breaks during prayer, should he just leave and leave a gap in the saff? What should he do in this regard?

Standing behind the imaam if there are no other muqtadis

Q: I started performing salaah with the imaam and because another person was just there, I stood behind the imaam expecting the other person to join the salaah as well. But that person went to perform wudhu and we completed the whole salaah in this manner.

1. Is my salaah valid?

2. Should I have moved forward to go to the right of imam when I felt the other person will be late?

3. Is moving forward during salah permissible and how much can one walk forward before the salaah becomes invalid?