Not Xabi, my friend, but Xavi Hernandez. He is a Barcelona legend. He also took Barcelona to a higher level as a technical director. Today, everyone congratulates Flick, who replaced him, but Xavi is the person who best transferred La Masia to Barcelona's main squad. Before his management, Barcelona was under the impression of being a mediocre team, but he made many changes as soon as he came to the team. He brought very important players from the youth academy to Barcelona, which was going through financially difficult times. Thanks to this, they also won the championship. Flick created today's Barcelona with a few touches on the team he left behind. In other words, in my opinion, Xavi is the architect of Barcelona.
Finally someone acknowledging Xavi for his time at Barcelona, personally I think Xavi during his time at Barcelona had more challenges than the one the club has now, then he was under the board management of people who weren’t even looking at taken the club to greater heights, the likes of Bartomeu were simply just wasting resources and when they got bankrupted and weren’t even able to pay wages for players and it was down to Xavi to rebuild the team.
He had to rebuild the team around the club academy and that is the fruit that the club is enjoying today. The only major problem Xavi had that makes Hansi Flick stands out is the experience. Xavi fell out with so many players that he shouldn’t and prioritize more of Spanish players than other nationals which was what changed under Hansi Flick
If Xavi had been in charge of the team this year, they would probably have been similarly successful. Because as you said, Xavi had laid the foundation for this and would have reached the level where he knows how to play with the team best. However, the Barcelona management, interestingly, did him an injustice by not wanting him on the team, in my opinion. In my opinion, Bayern Munich has been unfair to Nagelsmann and Barcelona to Xavi recently. If both of these managers had stayed on their teams, they would have been much more successful teams this year. Flick still manages Barcelona very well. There is very little to criticize about his management.