Even though Jude Belligham is Real Madrid's top scorer at the moment, in my opinion they need a single striker as a solution to make their front line sharper. Joselu was not an alternative when Real Madrid reached a dead end because his style of play was not as prominent as that of a classy striker. When Real Madrid has a world-class striker like Mbappe, if they succeed in bringing him in, their game will be much more terrifying, like when Benzema, Ronaldo and Bale play together.
When they face a team that is much more balanced, this is where a quality single striker is needed and Jude Belligham can focus more on helping the attack so that it will produce a terrible collaboration on the front lines. Jude Belligham also may not be able to score every match because of the tight match schedule they face and having a single striker can help.
I equally agreed with you about getting a permanent striker that will work together with Jude Bellingham, as you said that the striker must be a world class striker which you think is Mbappe which I believe is the perfect combination, seeing Mbappe and Jude Bellingham in the pitch will be a wonderful moment to watch. Jude Bellingham is midfielder am impress because from the very first begin, I see him has a goal machine because he scored goal in every match he played, truly this is a plus for Real Madrid and I will consider him as the best sign player this season for the club. Ancelotti will be happy with Jude Bellingham because of is credible performance and also the entire club will be happy to be seen the future Ballon d'Or winner. Jude Bellingham start is like Cristiano Ronaldo that is a good start by the way.