I think we are talking a bit more about Girona, Girona have been performing well recently but Real Madrid and Barcelona have been performing well overall so I think we should talk more about Real Madrid and Barcelona. Girona have started well in La Liga but they will not be able to sustain their good start into the mid-season. As consistent teams I see Real Madrid Barcelona and Atlético Madrid who can be consistent from the beginning to the end of the season.
Girona's performance will continue to deteriorate when facing tough opponents. Although Girona is in a good position in the points table, at the end of the season you can see either Real Madrid or Barcelona in the first position in the points table, the competition will be between these two clubs.
It's true that in the end we will see the La Liga standings like previous seasons, only two or three clubs were able to be consistent and stable until the end of the season, namely Barcelona, Real Madrid and ATM. I agree with you, Girona appearing as a dark horse this season is surprising, but they will not be able to survive until the end of the season, in fact I don't think Girona can finish in the UCL Zone.
If you look at the clubs that Girona have beaten this season, none are above their level. We have seen how Girona played against Madrid, I think they can consistently get points, but they can't beat elite La Liga teams like Barcelona, Madrid and ATM.