Xavi seems to have succeeded in building his young squad better than Real Madrid. Lamine Yamal, Gavi, and Balde contributed to Spain, especially in international matches. This young player's performance is also good at club level so I really respect the way Barcelona builds their squad.
Not only that, Barcelona has succeeded in taking advantage of the transfer market this season by only paying very low costs. I can imagine Barcelona would probably be very strong in terms of squad depth if they had a transfer budget of 100 million euros this season. Barcelona and Real Madrid's rivalry this season is sure to be great, but I believe each of them will have problems to solve throughout the season.
Real Madrid and Barcelona have increased the depth of their squad with an average of young players. Like Barcelona has a number of players with young ages and Real Madrid also does it. Now both teams are regenerating young squads for the upcoming season. However, the young players brought in by Real Madrid in this transfer window have not played in LaLiga like Arda Guler because he suffered an injury in a pre-season match which made him miss the first match of this season.
On the other hand, I see Sevilla in 20th place in the standings. Well, I doubt Sevilla fate this season because they were European champions last season but they didn't make big improvements in the transfer window to improve their strength. I think Sevilla will continue to fight to stay away from the relegation zone as like they did in last season.