Barcelona have been looking for Messi a lot on the field this year. When big stars fall, they create big gaps. They couldn't make up for Messi's absence. If they don't create a big star, they will lose the league to Real Madrid again. Real Madrid have the advantage of dominating the league more than ever. They seize this opportunity well. The Spanish league will be similar to the German league.
Barcelona is looking for the right replacement in the position left by Messi. Ansu Fati has been given the number 10 which has previously been used by Messi, number 10 is a sacred number in Barcelona, not just any player is entrusted with wearing the number 10. Ansu Fati is still too young to be given great trust by Barcelona, Ansu Fati's appearance is not as agile as Messi when he was young. Xavi is expected to be able to make Ansu Fati as Messi's successor, but it's not as easy as imagined, because the characters of Messi and Ansu Fati are very different.
It is not possible for xavi to make ansu fati to be like Messi.. nobody made Messi to be they way he performs, his style of performance is part of his character. It is impossible for a coach to start building a player like Messi. Number 10 is a key position that not all regular player can fit in, Messi was the best for it .