Atalanta has shown us how to organize a great team with less money, and how to perform exceptionally well. Their performance in the previous season surprised me. I would say they have done better than Juventus. Despite having so many star players, Juventus did not perform as expected.
Atalanta were absolutely better than Juventus in the last season. Their having the same points at the end shouldn't mislead people. Atalanta had a more decent performance in general. This shows us clearly that the squad quality is not the most important thing all the time. If there is a really strong teamplay, everything is possible.
You are right. Having star players in the squad does not mean that the team is the best. There must be coordination between the players. Good performance is never possible without coordination. The Juventus team relies heavily on Ronaldo. Juventus's players have to reduce this dependence and try to play well in the own position. Then you can expect a good result as a team.