Popped up with his ninth goal against Manchester United in a dominant 3-1 victory for the champions.
But now in their third seasons in charge, Guardiola and Mourinho's reigns have instead seen a chasm open up with the blue half of Manchester now the dominant side of the city. Only twice have they won by more than one goal all season, to City's 12 multiple-goal victories.
Despite a hard first season for Guardiola in English football, City finished that campaign nine points ahead of their City rivals. "I'm so satisfied we maintained our level".
The Dutchman was his usual, powerful self at centre-half in a 2-0 win over Fulham yesterday.
"After we scored after our first goal we could have been a bit more aggressive and tried a little bit more", he told MUTV, United's own television station.
Fernandinho found Bernardo Silva in a pocket of space i front of the United back-line and the Portuguese took David De Gea by surprise as he rifled a low shot just wide from 20 yards out.
Although United pulled a goal back through Anthony Martial after 58 minutes, Ilkay Gundogan killed the game off when he finished off a devastating move which featured 44 passes.
But when this point was put to United manager Mourinho, he replied by saying: "I think we are not going to be relegated".More news: Scale of California's Deadly Camp Fire Shown in Satellite Photos
It was champagne football that showed why City are champions and United struggling to make the Champions League.
This was United's fourth defeat in 12 games and left them eighth in the table.
United travel to the Etihad on Sunday already trailing their neighbours by nine points, but hoping to continue their strong record on the east side of Manchester, where they have not lost since 2014. I can imagine when the result was 2-1 to bring on a fresh Fellaini, I think they would be in big, big trouble.
On a emotional day, Leicester dominated against Burnley but failed to break the deadlock and the match ended goalless, two weeks after the tragedy outside the Foxes' King Power Stadium.
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And it's true, bashing in five goals is a nice-to-have rather than a necessity, but even so, the list of teams to win the English title without scoring five or more in any of their games is a short one of 13 sides, four of them in the Premier League era. It was not to be however, as City are less prone to sudden defensive collapses now and came out 3-1 winners.
Mendy also claimed City will focus on the negatives of their performance against United when they arrive back next week. And all of that is down to the man who picks the team and devises the tactics.