Not sure if this also applies to Serie A, but in some leagues, the winner is decided based on their second-half performance of the season. I remember that Man City usually stumbles in their first few games over the last few years (including when they won so many trophies). I think the competition was even tighter last season, right up until the last few games for Serie A, too? So yeah, I'd also think twice before making a bold prediction on who will win the league this early in the season.