Not only Liverpool, even Leverkusen who were highly favored at that time had to experience defeat, and what was even more surprising was that it was their first defeat and the only defeat they felt last season. I'm sure at that time everyone was on Leverkusen's side, except for those who were Atalanta supporters, even if Atalanta supporters were realistic by looking at the statistics of both teams they would also predict that Leverkusen would win.
But this is football where everything cannot be predicted precisely and Atalanta proved that they could beat an undefeated club and they did it in the most important match, namely the final match. This is one of the factors why football is a sport with the largest fan base in the world. Here it is full of surprises, no matter how strong the club is, if they have to lose in the match, then they will lose.
That part was the one that I got shocked the most, it wasn't even a close game neither, for both of them. Atalanta beat both of them 3-0, and that seems like something that shouldn't have happened, it's definitely a crazy thing to see something like that, we are definitely confused to see it.
In the end, we could consider this as "normal" if you think about how things aren't really that crazy, it's literally what we are talking about and not something that's unheard of, it is not normal.
Atalanta definitely doing something right, this Gasperini dude took a few years to get here, btu he really took the team from almost nothing to here, and that's something awesome. I am guessing that he is going to keep growing the team as well, and team management looks incredibly happy with him, not just right now because he won the Europa because they were happy with him before that too and kept him around anyway, which shows how much they trust him. I guess hat we are going to end up with something that could get a little better, so at the end of the day it is going to be something that could change things, it is going to end up being a little different and could be very important if he stays another decade.