I think with or without the red card, Barcelona will still defeat them because the matching a revenge match for Barcelona following the 1-0 defeat Real Sociedad defeated Barcelona in their home in their Laliga first leg match; and this match is very important for Barcelona to win because it will give them the chance to lead the Laliga table ahead Atletico Madrid and Real Madrid and they finally lead with one point ahead of Atletico Madrid and three points above Real Madrid.
I agree with you. Barcelona has taken revenge for the previous defeat in this match. From the beginning of the match, we have seen that barcelona is very aggressive. At the moment , Barcelona players are very confident and they are in good form. The team has been able to play well in the last few matches . So Barcelona's only target against Real sociedad was to win . Even if defender ELustondo did not get a red card, we believe that Barcelna would have been able to secure 3 points from this match in any way.However , as a result of ELustondo's red card , Barcelona won by a large margin of 4-0.