The arrival of Mbappe and Endrick has great potential to make Real Madrid even stronger but on the other hand, this will also make the battle for places in the first team even fiercer (particularly on the front lines). If Arda Guller ends up staying with Real Madrid next season, then he will also be in that fight. Obviously it won't be easy, because he has to compete for a place against Vini, Rodrygo, Bellingham, Mbappe, and Endrick.

This condition might also be a headache for Carlo Ancelotti because it's not just about determining the best decision but he must be truly transparent so that the decision does not give rise to assumptions among the players that might actually trigger jealousy and unhealthy rivalries.
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I think after Madrid brought in Mbappe, of course their have closed the door to the transfer of other attackers but I don't expect that previously Madrid had brought in another attacker from Brazil, now of course the arrival of the two attackers will make Madrid attacking line full and make Ancelotti have many options as well as a headache in determining the players who will indeed fill their main line-up next season, the arrival of Mbappe alone has actually made Madrid attacking line quite dangerous, but now they also have young Brazilian players who do have extraordinary talent and have the potential to provide difficult competition for Rodrygo and also Arda Guler to get the main spot.

The arrival of these two stars of course now makes Madrid's attacking line quite dangerous and I think it's time for Arda Guler to decide his future in Madrid, because with the arrival of Mbappe and Endrick will of course make Arda Guler chances of playing in the main squad will be less and less next season, at this time of course Ancelotti must really be able to maintain team harmony because indeed every player will of course demand to be able to get a place in the main line,  So there is a high probability that there will be jealousy or unfair competition in the team later like you say.