Exactly. Most of the time strong clubs field second string players against weak teams or rest their best players. That opportunity is used by the weak team players to attack the strong team and defeat them. But in the Barcelona and Vallecano match Barcelona second string team was not there. They took the field to face their opponents with the best players in the match. It is really surprising that clubs often do not learn from previous analyses. They soon realize the consequences of underestimating weak teams.