Jude Belling have announced his interested for joining Real Madrid upcoming season, nice respond from Madrid management to signing him because will be right option replacing Luka Modric position. Reported from several media still not reach agreement deal between Madrid and Dortmund exactly with transfer values, I don't think with Real Madrid in crucial moment because Modric still have potential for playing one year later with quit well performance.
Depend on expensive transfer values or not for signing Jude Bellingham and Real Madrid have many attacking midfielder right now and seems not hurry up to recruit Jude Bellingham if most expensive values.
It seems to me that it's the other way around. Bellingham is (ideally) a long-term project, so the sooner they start it the better. Plus, the team is not a car where you can change some spare part at one moment and move on. Modric will not last the whole season, and as I say here, you can’t wait that it will be like that: Modric finish and Bellingham will immediately continue. Ideally, he should start playing at Real Madrid next season. Plus, if you wait another year, then you can wait until Bellingham changes his mind and moves to another club.
I think there are advantages and disadvantages to both scenarios. Bellingham wouldn't be the first who can't manage to carry the burden at a club like Real Madrid. There have been cases where staying at a club like Borussia Dortmund for just another year was the perfect decision. I remember how long it took Dembele to play an important role for Barcelona and he was an outstanding super talent back at the time. This season it is the same thing for him. He starts in less than half of the games. I can't recall the amount exactly that Barcelona paid, but everyone thought that he is going to have his immediate breakthrough at Barcelona. That step might have come a year too early. He was about the same age that Bellingham will be by then.
But I am not saying that you are wrong either. The example you brought up with the car is quite true. There is only a very small number of players that can be implemented in a team and they work perfectly right away. Haaland is one of them.