Atlanta winning Liverpool at some point in the league was supposed to be a lesson to Leverkusen not to have it lightly will with them because they were looking like they will not cease to utilize every privilege and opportunity they have got if they eventually get one just like they did against Liverpool even with the whole strength exhibited by Liverpool then in the Europa and their domestic league aswell, Leverkusen had a tough task ahead but it appears they weren't ready for it and so they lost the game to Atlanta who then became the winners of the league title.
The win against Liverpool seemed to be a turning point for Atalanta. It gave them a confidence booster that made them having strong performances in the remaining games of the season. Their effective attacks and strong defense were really being tested successfully. Gasperini made the team know their own capability to beat any team.
Leverkusen put themself under pressure by the ambition of chasing unbeaten record. It took toll on them making it hard to have a proper preparation for the climax of the season. Every thing went out of control after conceding 2 goals in 25 minutes. That was not a common game where they can make a comeback with late goals, and they have to accept the fact that they were lost because of themself.