It is unlikely that Flick will be able to increase anything, since he refused new transfers, given the financial situation of the club. Injuries will happen in any case, and of course Real Madrid have much greater depth in the squad and the Real bench is very high quality, I think Real could make another very decent team with players on the bench. If Flick faces multiple injuries, it will most likely be an unfixable situation for Barcelona, but there is no need to think ahead, problems need to be solved as they arise. Barcelona has a good squad that can compete even with Real Madrid.
I agree with you. Even if Madrid make their bench players a new team, they will still be able to compete in the top 10 of La Liga. Real Madrid really has an extraordinary squad this season. The depth of their squad is really very good. I think Real Madrid will be champions again this season. I think Barcelona still has a chance to compete with Real Madrid. It will still be like you said if several key players are injured then it will really affect the team's play as a whole. Barcelona does not have as good squad depth as Real Madrid.