Jude Biellngham is good but Madrid already had excellent attacking Midfielders. Let's not react as if Bellingham alone will give Madrid the title less we get disappointed. German football isn't the same as Spanish. In a team made of collective stars, factors like loss of form due to influence/ pressure from other players do affect performances. I wish this doesn't happen to him when he finally arrives. All we should pray for is that the team returns to it's formal understanding (team understanding) and winning mentality, cuz the analysis of Madrid's performance in last season shows a lack of confidence.
I think this understanding that you have conveyed makes a lot of sense because from several examples of facts on other teams it has also been seen that new players who enter a team that already has many stars will certainly have influence and pressure that the new players will feel. But for Jude Bellingham, it is hoped that this will not happen because Real Madrid is trying to make the team win again with a very strong mentality. Because in the last season it was very visible that Real Madrid was very easily beaten by its rivals.