Well, one of the concerns about this team is the egos of the young players, which can often arise when they can't control them. But I hope they can keep their egos in check so they don't always want to stand out alone. They must maintain good teamwork and maintain good relationships as well. And I'm sure their love for their homeland will keep them in good chemistry on the pitch. Even though they play for different clubs and some of them are even rivals, when they are united in the national team, I'm sure they will be able to maintain good cooperation. And so far, everything seems to be very good.
I have not seen any case of egos, or any reports of such, so I wonder where this is coming from. If anything, the Spanish team has one of the most connected teams in Europe. They play like a family, and it looks like they're all friends with each other. Even players like Cubarsi and Hujsen, who are rivals in club level, are very close to each other. Yamal even teases Hujsen a lot, so I don't understand where the talk of egos is coming from.
All Spain needs to win the World Cup is good management. They have a very solid team in all areas and they can go ahead to win any trophy they want. The only area they lack is the striker. They don't have a reliable and experienced striker yet. Morata is experienced but he's not reliable. Aside from that, they don't have any other position that they should be worried about. They have good CBs, they have good FBs. In midfield, they have one of the best midfield in the world and they have very good wingers too. Their management just needs to find ways to keep them sharp whenever they play together and they will be good.