Yes, it's true that Barcelona started the league less well. Unlike Barcelona in general, they must rise again. Neymar transfers do not take place, so all Barcelona related parties can focus back on la Liga, they must rise and start with positive results.
The team has to guard against complacency. After eight laliga titles in eleven years, it's very easy to lose focus and take victories for granted.
Atletico Madrid are also strong contenders after their perfect start to the new season.
The season still has a long way to go and there would still be lots of changes at the top of the table