It was just a cup match and in regular time Napoli were able to keep a draw even though they played with nine. In extra time, they simply did not have the strength to resist (and it did not make much sense). I think that by the next match in Serie A they will have time to recover and, given that their opponent will be Bologna, they will have a good chance of winning.
Still it was not the expected performance from a team competing for the serie A title plus the first team to get a red card was fiorentina it was a stupid mistake from lozano to get a direct red card 20 minutes from entering the game now they are out of the cup and far away from the serie A title.
I think that all fans and betters have long been accustomed to the fact that national cups are at least in 3rd place in priority. The first priority is the championship, the second European Cups. Therefore, the results in the national cup are unpredictable in terms of the strength of the teams, because priority matters here and many strong teams do not try to perform successfully in it.