Only Barcelona have a perfect points so far (9 points from 3 matches), no one would be wrong to expect them to become La Liga champions this season, but that's too soon to say, we haven't even go to the first El Clasico of the season yet, so even though Barcelona are currently having a good run, we can't know how they will be after that.
About Barcelona's match against Rayo Vallecano, I thought Olmo played well, it's a shame he didn't play from the start, maybe if he played earlier we could have seen Barcelona's third and fourth goals.
I like the way Barcelona plays, they control the ball well and by the way they could have scored a few more times in the second half and I think the goal that the referee cancelled was a wrong decision, but the most important thing is that it did not affect the final result. Yes, Olmo has fit into the team very well, I even remember him more for his long-range shot into the crossbar, it was very beautiful, and Lewandowski is also in good shape by the way. 9 points is good, it is too early to draw any conclusions, but it is good that they are moving so confidently, and Real will go to Las Palmas tomorrow, an unyielding opponent, especially at home.
Barcelona finished the season in second place last season and have started the new season where they are currently second in the points table with 100% wins in their first two matches. Barcelona have sold players every season due to financial woes and are set to do so this season as well. They can at least do well in La Liga with the players they have in their squad so far but if they sell more than one of these players the club's performance will come to a screeching halt. Since they are in big financial trouble, if they can't make big money by selling players then they can't get out of this bad situation.