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.
Girona performance this season is actually never like before because I no that there last season they were also very much in a good form but however is nothing compared to there performance this season because they have a very clean record this season and even real Madrid and Barcelona are even surprised the way Girona has stood on that position for a long time so however if they manages to maintain there performance the way they are currently doing I'm sure that they will win the league.
Although it seems that Manchester City is majorly focused on the premier League and champions league I believe that's were there targets and energy is right now that's why they don't care too much about this league