I have different view over this. I meant Brest is at the top, but they often fought against the weak teams. It's kinda different when they are gonna face Real Madrid. This pretty much the same situation like when Real Madrid fought Atalanta.
Real Madrid at the midtable, and Atalanta was topping the competition by winning all of ez games, yet they able to destroy Atalanta.
What's the difference then?
In my opinion, the difference lies in the team, Real Madrid has a roster of players worth 10 while Atalanta's roster of players reaches 1 if it goes well, also in terms of expenses and wages.
Obviously the performances will be different, obviously. But that's not a given, football isn't established so the weakest team can beat the strongest team.