Hes not the first to be sacked. Probably Pep and Klopp are the only premier league managers not to have been
Some team will take a chance on him. Hes played in a few countries now so I can't see a problem.
Doubt if City will take him back though
It does work that way but Leipzig are in their also and have not played United yet so it gives a false impression.
If United draw or win against Leipzig they will go through.
If United and PSG both win then both will go through but PSG will be top of group due to head to head.