That means that those who perform badly at the beginning of the season will not necessarily show bad things again in the journey of the season until the end, all teams can improve themselves, change more effective strategies to fight each of their different enemies.
Indeed. Even if performing badly in the early season, it doesn't mean to perform badly in the whole season. However, it is important to perform well in the early matches, it will increase the chance to win the title or finish in better positions.
Juventus sometimes looks convincing in every season and is always talked about as a candidate for the winner, but what they did like last season was lose their consistency in the middle of the season until the end and produce disappointing matches, this is what I doubt about Juventus even though this time they performed well at the beginning of the season, so did Inter Milan but I am quite sure about Inter Milan if the performance they will show is like last season.
Not in every season, but they looked convincing in the early of the previous season but they ended up the season at 3rd place only.