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But I am sure that if Guardiola had ever coached the best PSG team they had in recent years, they would have had a much higher chance of being way more dominant in every single competition and they would have a different squad. He would have added some decisive players on some positions and he would have taken care of a well balanced team.
It's possible for any coach if a team is willing to give them a chance for a few seasons instead of just 1 or 2 seasons. Manchester City gave Pep Guardiola many opportunities and they also put a lot of faith in Pep by following his wishes and plans every season, as a result Pep Guardiola really succeeded in proving that.
Every trainer can experience the same thing if they get good support financially and stay longer. At PSG there is a lot of pressure especially because they have set high targets every season in the Champions League. Not a single coach has won that title for PSG yet, but Luis Enrique has a chance to do so if the two things I said are fulfilled by PSG.
The success or failure of the team depends a lot on how the manager manages the team. If Pep Guardiola was in charge of the manager at that time when PSG was a strong team, he would definitely have brought success to PSG because he would have found out PSG's weaknesses and would have changed players there. If a team has relatively weak players but has a lot of experienced managers to train them then one can expect good performance from that relatively weak team but without good players and good coach one can never expect a good team performance. Right now psg has a good quality manager but when psg appointed good quality manager all good players left their team now let's see how luis enrique revives this team.