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.
I definitely agree with you that part of Barcelona problems dropping points this season is because of their injury crisis, players like Araujo have been a very long term absentee and there are some like Gavi and De Jong who just resumed of recent but this injury to me haven’t hit them as it has hit their rivals Real Madrid, also they have been opportune to have this new crop of youngsters that do come up to help the team when called upon, if it is not this I think their Squad depth would have easily be lacking and also been identified by the opponent. Other than this there is also matches were the too many changes had been done to the starting line up and it has cost the game like the Osasuna game, and also the team somewhat switches off in game and they have ended up dropping points for that.
Also it worthy to know that both Yamal and Kounde have started a game together this season and they have lost which is the Monaco game in the champions league