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.
Athletic Bilbao could win the Copa Del Rey trophy this season because Mallorca is not a very strong team this season if you look at their performance in La Liga this season. Because when Athletic Bilbao was able to beat Atletico Madrid in the Copa Del Rey, I didn't think that Athletic Bilbao would fail in the Copa Del Rey final. Moreover, the opponent is Mallorca, where in the La Liga rankings the team is in a position that is very close to relegation so it is quite possible that this season's Copa Del Rey trophy will be won by Athletic Bilbao.