It is very important for Barcelona to get some help from their Catalan friends. Bilbao plays only Catalan players for those who do not know, and that's where Barcelona is. Right now,
Bilbao is not in Catalonia. Bilbao is a city in the province of Biscay, which is in the Basque country in Spain. Athletic Club only employs players from The Basque country and not Catalans.
I think Barcelona experience a decline in their performance following the injury cases they had in their players but their dropping points has created more room for a more competition in the league because we now see Real Madrid, ATM and Bilbao trying to do better to catch up with them so that they make the league become more interesting.
I agree with this, and this is going to be a problem Barcelona will face for the rest of the season. They have so many injury-prone players but luckily for them players like Pedri have not gotten injured this season and Olmo has not had a long-term injury.
Barcelona have not lost a game where their whole first 11 was complete and they've not lost a game that Yamal started this season. If Barcelona can find a way to not get injured and avoid unnecessary mistakes like what Kounde did against Betis, they have a very big shot of winning the league.