I saw the match earlier, it seemed like Bayern Leverkusen's defense was lacking focus. If you look at the second goal scored by Arsenal, it was purely the goalkeeper's fault who misdirected the ball, and in my opinion the Leverkusen goalkeeper played badly, in the first half Arsenal was very free to create opportunities, as evidenced by Arsenal scoring 3 goals in the first half, unlike Leverkusen in the first half there were no significant opportunities.
yes I agree This should be an evaluation for Xabi Alonso in the future to improve the back line which is less solid. considering what Bayern showed in their pre-season tour which played less well, it seems that Alonso's strategy for now can be broken by another coach, unlike last season which was undefeated, and there should be changes created in the match against Real Betis later.
In my opinion, it is very natural that the Leverkusen goalkeeper performed poorly in that match, because he has very minimal experience in facing a team that has a fast attack like Arsenal, so far he has been a reserve goalkeeper and only had very minimal opportunities to play in the main squad, so I didn't It's surprising that he looked bad in that match, especially without strong defensive support to help him keep the goal from conceding.
Leverkusen's glory last season seems impossible to repeat for now. I hope Xabi Alonso realizes this and starts to fix what's wrong with his team, and maintain their mentality as before.
talking about goalkeepers He does have the status of a reserve goalkeeper, but this match should be a motivation for him to show his abilities under the crossbar. If he continues to play like that, I don't think there will be a chance to get the coach's trust and continue to fill the bench.