This condition certainly led Atalanta to win the Europa League and is ready to add to the Italian quota that will play in the UCL. Leverkusen, on the other hand, ended their unbeaten streak this season and they certainly failed to win 3 trophies this season. They may still have a chance to win the DFB-Pokal against FC Kaiserslautern.
Surprises like this often happen when the favorite team is defeated it's just that we didn't expect Leverkusen not to score
Regardless of whether this is just luck for Atalanta what is certain is that 3 goals is the best achievement moreover this is the final match.
H2H from the previous two matches, of course Atalanta is superior. But many people, including me, think it's time for Leverkusen. The most basic consideration is that Leverkusen is unbeaten this season in the Bundesliga, while Atalanta is still struggling in Serie A to maintain 5th position so they can play in the UCL in the next season.
Yes, the match is over, and this is the condition on the field. One goal turns out to be difficult to get, let alone win the match.