I thought Atletico Madrid could make things difficult for Barcelona, but I was wrong. In fact I think like you, because they concede the ball too easily and it looks weak like in your picture. It seems Madrid have to learn a lot from Barcelona so they can make Atletico like a docile cat. It seems that Jao Felix became Barcelona's differentiating actor, with his anger he worked hard to make Simeone feel guilty about letting go.
Everyone must think the same, we all expect an interesting match between Atletico Madrid and Barcelona. But I see only Barcelona who played seriously because Xavi used a good lineup. Although some young players on the starting lineup, it looked effectively. Meanwhile Atletico Madrid tried to use a new lineup, some players on the lineup aren't the key players. Unfortunately, it didn't look effective, Atletico defense quite easy to destroy by Barcelona players. Even Lewandowski could play very well, he scored 1 goal and made 2 assists. Atletico defenders didn't do a high pressure on Lewandowski, it was a big mistake! True. In this match, surely Jao Felix also played well, not sure if Atletcio Madrid wants to let him go to Barcelona after seeing his performance in this match. 
Joao Cancelo and Joao Felix don't seem to want to return to their respective clubs next season even though they actually don't know what the future holds. Barcelona treats these two players very well and both players are able to give their best for their team now. Felix would definitely be happy if Barcelona wanted to make his contract permanent, as would Joao Cancelo.
In the last two matches between Barcelona and Atletico Madrid, Joao Felix was able to score goals. He was relied on by Xavi and Felix repaid that trust with a goal for a team that neglected his quality as a player. As long as Diego Simeone is still the coach of Atletico Madrid, Joao Felix will probably not return to Atletico Madrid regardless of where he is loaned or sold permanently.
With this result, Atletico Madrid is out from the top 4. Athletic Club overtakes their position in the 4th place. If Atletico Madrid still can't play consistently, Athletic Club possibly stays in the 4th place because they seem playing more consistently toward the end of the season. Now, Atletico Madrid can't miss any points again.
Competition for the Champions League zone will continue until the end of the season. Athletic Bilbao is not a very consistent team in my opinion, so Atletico Madrid still has a chance to win Champions League tickets at the end of the season even though they currently have a 1 point gap behind Bilbao.