Back when I was young, the most talked about manager was Arrigo Sacchi. Jeez how excited he was.He was the first to bring in attacking football back in a rigid 'Catenaccio' Serie A football, but that's not all. His team was breathtaking. AC Milan's defence was solid rock. his midfield a joy to behold and his forward line was a goal machine.That's a good question.
I would like to see him in a smaller club though, at the moment he doesn't handle well scrutiny.
When he moved to Italy, the vibe was that he'll win the WC easily. Sacchi left Vialli and Mancini out of the WC squad because of some stupid joke. That alone would drive everyone mad but not this time round. Sacchi might (and was) an A Class Ahole, who would leave top talent simply because he wanted to make a point and had just decided that AC Milan was good enough to win the WC but he was Sacchi and Sacchi = success. It turned out that it didn't and when an amazing Baggio got injured there was no one available in that Italian squad who had the necessary experience/attitude to carry the team to success. After that Sacchi's myth shattered. How could this Brazil, filled with Serie A rejects/small timers beat Italy. Taffarel was at feckin Reggiana, Dunga had just finished his career at Pescara, young Aldair was already decent at Roma but he was no Baresi, Mazinho was decent at Fiorentina etc.
After that experience his career took a nosedive. Success became non existent, his excuses and near misses increased. He argued with everyone around him including his no 1 disciple Capello who he mentored at AC Milan. Finally it effected his health too and was forced out of football. In some part its a tragedy but football speaking it was a god sent as he might easily have ended like Clough did. Nowadays they invite him to talk shows to have a laugh at him as he always ends up coming out with obsolete solutions to problems or ends up questioning why some random player cant do what good old Van Basten used to do. When friendly nudged by managers (ex Allegri) that his line of thought might be a bit meah, he goes full defensive mode while demanding respect and challenging them to win the CL.
In many ways Mourinho reminds me of Sacchi. Both bought success (Mourinho more then Sacchi tbh although the former won more), both changed football, both remained stuck to their ideology even though football moved on and both are kicking and screaming their way into oblivion. I am not trying to justify United. We're in shambles at board level. However those who blame us for Mou's decline need to acknowledge that the guy had failed to reach expectation in both of his previous jobs too. Some might even say he jumped ship at Inter because he was scared of facing the daunting experience of keeping Inter on top without an open cheque book at his disposal.
If you ask me, United had exposed Mou's weaknesses. His inability to identify the right talent, build sides that endure time, tweak his system to fit the situation and keep the players motivated. This will cost him big time as transfer fees had grew so big that very few clubs can give managers a blank cheque with little to no regard of what happens next anymore. Even the great Real Madrid are hesitating now (Pogba, Neymar, Mbappe)