for this situation, I think we can compare Zinadine Zidane and Ryan Giggs. When Zidane manage Real Madrid, in the first year he get a champions league with that players. And now with manchester united play in under champions league competition called Europa League, with their squad now they can win the europa league with Ryan Giggs.
Ryan giggs should be much better coach compared with mourinho however Im pretty sure that the reason why manchester united doesnt give ryan giggs the chance to be the next coach is probably they dont want to sack ryan giggs incase he is doing bad so they still let him learn at this moment however mourinho definitely needs to be changed
that was a good way to think about how manchester united treat ryan giggs , but in my opinion it's pretty clear a big team like manchester united won't to hire a manager that not have experience enough like ryan giggs , he must have spent a lot of time enough to manage a club then back to united later. so far i see skybet provide an odds for mourinho to leave 20/1 pretty high

That is probably the reason why he is not the coach until today. Obviously manchester united got a good eye for talent so giggs talent wont be wasted just like that so they are still giving some time for giggs to learn . The chances for mourinho to be sacked will be quite high if their performance is still bad until the boxing day