City were most football fans' favourites for the title before the season started and they're showing exactly why that was the case. But what would happen if they didn't have De Bruyne?
"It feels great to be part of this team and score my first goal for Manchester City, I've very happy for this". It gave Walker time and space to pick out Gabriel Jesus's run to the near post, and he made no mistake from close range. "They help us a lot and David is one of them".
Yesterday, he showcased his brilliance again.
The win took the Citizens up to first place in the standings, passing rivals United along the way.
That came after another commanding performance, and match-winning goal, against champions Chelsea prior to the recent international break.
Manchester City have already netted a mind-numbing 29 goals this season - a feat that is entirely unprecedented in the history of the Premier League.
Even more impressively, De Bruyne's 68 league assists since the 2012/13 season is matched only by one player in Europe's top five leagues. Just to put all of this into perspective, in 100 City appearances he has manufactured a groundbreaking assist total of 38 and a goal tally of 25. Find out by following our live matchcast.
City going for their third successive victory in Group F.More news: Wi-Fi Alert: Researchers Discover Serous Flaw in WPA2
Per Mertesacker had opened the scoring, but Watford improved in the second half and struck twice, albeit in controversial fashion.
"They do many, many things and the things they do they do perfectly".
In the last 18 games Premier League games, he has scored three - including that stunning winner at Chelsea a fortnight ago - and made 14 assists. His diagonal ball to Leroy Sane completely took Stoke's defence out of the game and Sane finished emphatically.
"We scored seven against Stoke and of course, I am pleased as our fans enjoyed it".
Guardiola also had special praise for Kevin De Bruyne who was superb from start to finish against Stoke.
But he says the in-form Belgium midfielder will need to win the game's biggest prizes on a consistent basis before he can be compared to the Barcelona superstar he managed during his four-year spell as boss at the Nou Camp.
"Can Kevin get to that level?"
"Day by day he is much better", Guardiola said.