The good news for Real Madrid is about their player Aurélien Tchouaméni and his situation.
Aurélien Tchouaméni was injured during this season and he couldn't play for Real Madrid after the El Classico game they had and according to some news he couldn't play for his team until February but he recently posted about his current situation on social media and he is going to be ready sooner than the expected time.
This is surely good news. Real Madrid needs more player available for harder matches in UCL and La Liga. They will have tougher matches in the UCL because they are already in knock-out phase. Fortunately, Real Madrid has no big matches in La Liga in the next few matches. So, Aurélien Tchouaméni can begin playing in easy matches in La Liga after he recovers from the injury. I'm sure it won't be easy to return to his best form after he spent a long time for taking a rest. Well, hope that Tchouaméni will recover very soon, so he can directly help Real Madrid to maintain good performances.
Considering the performance, Girona can expect this season's La Liga title. We really didn't expect Girona to perform so well this season at the start of the season. Every season ends with the hype of Real Madrid or Barcelona and every season starts with the prospect of Real Madrid and Barcelona and Girona start the new season fresh in that place. Out of 16 matches they have lost just one match and drawn one match and the remaining 13 matches they have earned full points, this statistic shows how much they are favorites to win the La Liga title this season.
As you said, it wouldn't be a surprise if Girona were La Liga champions this season, it wouldn't really be a surprise because they are favorites to win the La Liga title this season and they deserve it.
Everyone must be surprised about the performance of Girona. It is because Girona isn't an elite (top) team in La Liga. Many of their players are not popular players, the popular players are mostly old players. So, no one expects Girona to perform very well with their current squad. However, the coach of Girona, really succeed to optimize the ability of the players. In the midfield line and attacking line, there are many young players, it makes them to play offensively. Meanwhile in the defense line, most of the players are old/experienced players. The combination of this players, make Girona stronger this season. And the tactic and mentality of Girona players are also incredible, they showed us that they are not mediocre team anymore.
Well, I think it is still too early to talk about winning the La Liga title. But if Girona can always play consistently with their best form, it is surely not impossible to win it. However, if we consider the squad depth, I think Real Madrid is still the favorite to win the La Liga title.