If someone says that Manchester City can win the Premier League without Kevin, it is true, but it must also be admitted that the performance of the Manchester City team will decline slightly without Kevin.
He didn't play against Brentford. I read he was fine. It's just that De Bruyne feels uncomfortable. So Guardiola doesn't want to take many risks. He chose to rest De Bruyne. He doesn't want De Bruyne to get injured again. If you observe that De Bruyne is a genius player, he has a big effect on Man City's game. Just look at his debut after his injury, he immediately succeeded in playing well and making a contribution to the team.