1. Pep has inherited the best squad in the league by far and strengthened it further.
2. City already played possession based pass and move football before Pep arrived. All he has added to them is better fitness, better off the ball work in terms of pressing and better tactics than Pellegrini. Mourinho in comparison has not only had to add a new spine to the team, he is also teaching them to switch to direct, quick passing, pressing, playing in transitions football, that allows more instinctive play, a far cry from the controlling possession approach grilled into them by LVG for 2 years.
3. Baring Porto and his first Chelsea stint. All Mourinho"s teams have been best in their second season. It has always taken a season for them to truly reflect a peak play Mourinho team. I see no harm in similar patience at United.