If it is true that Real Madrid wants to go for him then this is the mistake Madrid Continue to make because they already have a good striker, they may just be adding too many young talents that may turn out to conflict positions because that will be two strikers who are just too good and will want to make the numbers for their name which may in turn affect the team at some point. Liverpool will be making a good move if they raise that fund and get isak it will be to their best interest.
You make good point that if Real Madrid brings in another great young striker they might create problem where two talented players fight for same spot which could hurt team later on. This is common issue for rich clubs that want all best young players as it is tough to keep everyone happy and playing enough.
However your idea about Liverpool buying Isak makes much of sense. If they can afford him striker like him could really help them especially if he fits clear need without causing same kind of team problems Real Madrid might face. What team needs right now can be just as important as how good player is on their own.
I think Real Madrid have a lot of star players but they lack the players who can win matches. If you talk about one of the best and most expensive players in the world, Mbappé will be there but he has not been performing well recently. Consider Vinicius Junior, Rodrygo or Jude Bellingham, they are very good players but they are repeatedly failing to perform well for the team. It is a hot topic that despite having talented players, why Real Madrid is repeatedly failing and what should be the solution. Ultimately, the solution is to make adjustments within the team and bring about mental and tactical changes among the players. Carlo Ancelotti has left taking responsibility for the team failure and he has been replaced by Xabi Alonso. He has to find the problems in the team and solve them so that Real Madrid can be strong for the next season.