I'm sure you are getting him mixed up with Sir Walter of Cardigan for being the most successful manager of all time (well Daily Record readers will think so). The reason I think he will be a bad fit is that for the last 15 years or so, since he left the beloved Porto, he has become the very definition of a cheque book manager. I think his style was successful but appears outdated now and doesn't have the same impact on players as it did in his early days at Porto and Chelsea.
He mostly seemed interested in buying established high profile successful players who were already at their peak rather than promising, upcoming youngsters who he can coach and mould into a successful unit.
And if there is someone there who doesn't exactly fit his style then they are ignored rather than developed to fit, and more cash thrown at buying yet another replacement. I think Man U had 6 centre backs when he left, most bought at large expense, and yet the standard was still relatively awful (relative to their competitors).
Recently, I can't think of any/many players that he has bought in the last few years that he has actually improved.
Spurs and Levy are notorius for not spending cash on improving their playing squad compared to other teams they are competing against.
His footballing style can be mostly horrendous to watch. He had a £1billion+ team at Real Madrid that often parked the bus in big games (yes, they could thrash some of the crapper teams in the Spanish league, which improved his goals per game stats).
Jose did claim a treble of trophies at Man U one season but this was the Charity Shield, League Cup and Europa League. The first is a pre-season friendly, the second no big English clubs takes seriously until the semi-finals and he went all out for the Europa as it was their best route to qualify for the following season's Champions League due to their poor showings in the Premier League. Although the Europa is an achievement, they were by far the biggest club in the competition and it was a competition he previously mocked other managers for winning as it was such an inferior trophy.
A final annoyance with him is how he always has to pick on a senior member of the playing team to have a public spat with, where he sidelines them and bickers about them to the media as part of some pathetic willy-waving competition.
In case you haven't guessed, I haven't like Mourinho since Seville in May 2003.