I am not surprised by this result, Atletico Madrid has not been consistent throughout this season, so that when they meet a comparable opponent, the Atletico Madrid team is unable to develop its performance.
I admit that Athletic Bilbao this season has been quite extraordinary and their success in getting to the final is quite natural, now I think they will be quite close to the trophy this season.
but to be honest, the 4-0 aggregate result hit Atletico Madrid. It was unexpected even though Bilbao's chances of winning were quite big, but I didn't think it would be a landslide advantage over Atletico Madrid.
It seems like there is an opportunity for Bilbao to shift Atletico Madrid from the top 4 positions in the standings. Bilbao's performance is quite convincing at the moment and this is an extraordinary achievement after several years of only being in the middle of the La Liga standings.