Brighton's results were quite surprising because they are usually quite strong when playing at the Falmer Stadium (American Express Stadium). 76% possession of the ball but Brighton was only able to score a goal from a penalty because a penalty rewards and AEK, who had very little possession of the ball, managed to maximize the opportunities they had, maybe Brighton were nervous? because this is his first appearance in the European league.
Brighton still played well in Premier League but they did not bring this form to Europa League. I understand it as many of their players are not familiar with Europa League.I It's very difference feeling and experience when you move from a national league to Europa League. It's harder to play in Europe as they have less knowledge about the opponent and mistakes in Europe can be punished straightly, not like in domestic league.
Not only AEK but other clubs in Europa League can beat Brighton if they make mistakes in any match. In cup format like Europa League, it is different than Premier League, two or three bad matches, then you go home and wait for another chance next seasons.
I don't understand why, but Liverpool didn't have their main squad of players in this match. Lask was able to score a goal for that reason alone. I guess Kloop thought it would be an easy game, but later he had to make a lot of changes to correct the losing situation. Fortunately Liverpool were able to confirm their status as favourites in the second half, but the game turned out to be a bit risky.
Liverpool do not need to keep their clean sheet and get a draw. They did their job well by winning the match even the goalkeeper got one conceded goal. The final result is how many point you get from a match is more important than how many goals you score in that match.
The result against LASK is good in result too as you can call it as a big win for Liverpool, not too big but not a minimal win.