For some reason when facing Leganes they seemed to lose their sharpness, Barcelona's attackers had a hard time scoring goals against Leganes. But fortunately Leganes' back line made a mistake that led to an own goal, and became one of the factors causing Barcelona's victory in the match. But never mind, the final score is not more important than the 3 points in the match, because through the 3 points Barcelona managed to widen the gap with Real Madrid and this further strengthened Barcelona to be able to win the title this season. Meanwhile, regarding their performance in the Champions League, they performed very well and now they are even one of the strongest candidates to be able to win the title. And so is their possibility of winning the Copa del Rey championship this season.
Barcelona match against Leganes was tough with their attackers struggling to score. But luckily Leganes defense made mistake that led to own goal helping Barcelona win 3 points. Even though score was not perfect Barcelona increased their lead over Real Madrid making their chances of winning title stronger. And that is right they are doing great in Champions League and also have good shot at winning Copa del Rey which could make this season very successful for them. With their current performance Barcelona is in good position to win multiple titles.
That's basically what counts in football especially when you are fighting head to head with other teams for the title. Barcelona currently are a very free flowing side with them being able to score as easy as possible and them struggling yesterday just shows how the leganes defense was really tight because Barcelona is one of the team currently you will play that definitely hard to defend against them.