Yes, there are four teams, but looking at point differences with each other, I will say there are three teams that are currently in this La Liga season title for now, but in a few matches to come, maybe these top three will mess up with their matches, and that can bring Bilbao points closer to them. In fact, right from the beginning, I did not put Bilbao in this title race because it has been so long since the season that Bilbao has been in the title race. In fact, the teams I feel can win this season's La Liga are either Barcelona or Real Madrid. In short, this season's title race is getting tougher as these three teams attention is diverted. These three teams are still in other competitions like the Champions League and other competitions so there are many matches for them to play.
Bilbao is like another team doing their thing more like they are competing with Villarreal, that's the only team that is close to them, they are 9 points behind Barcelona in the table and that means before they can reach the top of the table, they have to win like 4 games and the rest of the team at the top has to lose which is nothing but a mission impossible, if Barcelona drops, Atletico will take over and if Atletico can't, Real Madrid wouldn't allow them to win the league.
All the top 3 teams are active in tbe Champions League, if Bilbao is focus it's could be their best shot to take that chance to get there but they have used all their time to draw most of their matches. It's so funny that they have less draw match than Barcelona and same with Real Madrid but they got the biggest draw matches despite been the top of the table. I'm not trying to hate but they can't win the Laliga this season even if they try all they have this season.