Manchester City didn't have a good start this season because they struggled in the league to win matches at the beginning but for Arsenal and Manchester United they had a better start especially the Arsenal team who everyone gave the league at the middle of the season because they were beating any team that crosses their path except for few games which they lost but they were still seen as the favourite of the league. When Pep realize that they can still fight for the league he changed the game and took the trophy away from Manchester United and Arsenal but I believe it is a lesson given to the teams to always remain focus and consistent with good performance even though they see that the league is closer to them.
As for the fact that Pep changed the game and took the trophy because of it, I disagree a little. Nevertheless, the main reason for the next championship of Manchester City and Guardiola is that Arteta and his Arsenal failed to finish when they began to lose points en masse, where in theory they should not have done it. Which of course does not negate the fact that Manchester City had a very powerful finish in the Premier League, but still the root cause is a strong decline in Arsenal's results at the finish.