You hit the right spot Killyan Mbappe is a selfish player. He always play for himself. He is just a piece of sh*t. If he plays for himself definitely he will be flops just like Eden Hazard and that's why he didn't have many goals like Vinicius Junior despite naturally Killyan Mbappe goal scoring ability is much better than Vinicius Junior.
I think Mbappe will need more time to get used to the new team. Everyone knows about Vinicius Junior's bad temper, but he has a competitor in this field. Before the transition, everyone was talking about the competition between these players for a position, but now it's time to talk more about the competition in terms of personality 
) According to his playing role and previous performances, some game selfishness was already visible and Real Madrid was well aware of this when signing the player. Still, this is not Modric or Kroos in terms of organizing the game and Mbappe achieved his success precisely thanks to the successful completion of the team's attacks. And yet, according to the team style, Real Madrid is not Barcelona, which relies more on team interaction between players.