The season has just begun and we cannot conclude who will be topping the table because there are so many surprises that at e yet to come. Barcelona was able to win their two matches doesn't mean that they will continue like that till the end of the season.
There are some clubs that when Barcelona meets will make them drop points and other clubs will take over topping the table from them. Flickr is a good coach no doubt but I have not seen the best of him yet until in El Clasico.
Actually any team can top the table currently but it's not a guarantee they will be there long enough, stay there the longest is the biggest of all the struggles so if any team is at the top now, we can say they are topping temporarily but if they are able to hold on to the position for a period of at least 4weeks then they have got the title race opportunity, but what we know often is the temporarily nature of people who gets to the top of the table at the beginning of the season as it's no news but it will be on the record that at a time in the new season, they did stayed at the top of the table. Barcelona may be able to top now but how well they can maintain it is the problem because even other teams may at some point get them displaced.