There's another important side of it. Replacing Dinho with Jorginho doesn't mean City are improving attacking play whilst sacrificing the defensive side of it. Would be a mistake to think this way.
A Guardiola team defends from the front in short pressing bursts. It can afford only x amount of pressing spurts to make it effective, not 1.5x or 2x, as the team's energy is limited. It can afford to lose the ball only fixed amount of times. Lose the ball less, and you can spend more energy in every pressing movement in average. So, improving the side's press-resistance improves the ability to press aggressively and defend collectively.
Hazard after City game:
"I wouldn't have got a touch even if we played for three hours"
"If you have the ball, you immediately have three, four men on your skin."
"Three, four men". Not Fernandinho, Jorginho or whoever. Lose the ball less, and you'll be able to apply more intensive press. The opponent won't have space to move into, won't have time to think. Jorginho's (potential) acquisition is basically a step in this direction.