Im not sure which site did you use to check this fact but I used flashscore and this is all three of their compared

Rodrygo played 44 times and scored 13 goals

Mbappe played 47 times and scored 35 goals

Vini played 43 times and scored 19 goals

So if Xabi had to choose 2 out of three then its obvious which will he choose. Mbappe obviously is a proven player, first season and he literally carried Real madrid over his shoulders but too bad he didnt win anything this season.

Yeah Rodrygo is a young talent but if we are talking about young talent then its obvious Endrick is the youngest player around there with decent future ahead so Rodrygo is kinda in lacking in almost all aspects