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.
Barcelona start the so far with the better points not mean that they will be the one to become La logs champions this season, I think it’s too early to predict that for since this just started of the this season we should wait and see what the others team can able to do at the middle of the season; that’s the right time to know who are good to go for the season.
Because even the Real Madrid that where seeing now that they’re in the low points yet, they fit surprise people by took over the top standings from the Barcelona accept if the Real Madrid didn’t work with the their better squad because even in terms of the good players they cannot compare Barcelona with Real Madrid.