It is true that Girona has performed well this season, but their current existence at the top of the La Liga standings cannot be separated from the inconsistency of Real Madrid and Barcelona, so indirectly Girona has benefited a little because of that.
If you look at Girona's overall performance so far it is quite impressive and they just need to maintain their consistency, in my opinion it is very difficult for a team to maintain its consistency until the end of the season.
And it's not impossible that Girona could make a surprise until the end of this season, I think that would be very interesting if that happened.
They are so focused in winning La Liga, they will bring in support when the time for transfer begins. Just keep your minds open they may fall down or still go higher having Girona at the top a total underdog makes the other clubs to brace up and attack the league.
As we can see Girona took advantage of the momentum well. So Girona steps in La Liga are very well calculated. They know that no club can interfere in Real Madrid and Barcelona eternal rivalry in La Liga so what Girona can do is take advantage of the situation. Girona could lose to both clubs but the probability with the other club is actually higher. So this gives Girona a breath of fresh air sacrificing matches against Barcelona and Madrid but on the other hand they are fighting for big opportunities with the remaining clubs. For me, Girona strategy has been quite effective so far, with the result of 13 matches and one loss being a big achievement.