It come from the Coach
How Manchester City played in the first half of the match is how team that would succeed plays. If Manchester City has attack the way Paris saint German did, they might have concede like 3 goals in first half and the reason why first goal occurred was because the attackers didn't join the defense and they made correction after the goals
Pep Guardiola is sensible, he knew that PSG won't be able to play with power like they did in first half, and when he noticed that they've tired in second half, that is when he called his players to attack
The Manchester City winning come from their coach and PSG loss also come from the coach. Manchester City soaked Paris saint German's pressure in the first half and then attacked in the second half, Paris saint German attacked in the first half and they lost it in the second half. This is where Pocketino should make changes!
Like ten minutes before second half is when Manchester City has even get to know Paris saint German's weakness but and this is where Pocketino should know he would do something in second half