Barcelona is still too difficult with the club's financial problems. buying several players at a high price will not be good for their finances. Barcelona's best way is to exchange players with several agreements. or selling some of their players to bring in the players Xavi wants. I don't know what if Messi comes back, not only in terms of salary, but Barca's game will be good or even Xavi will have a hard time putting Messi in his place.
Barcelona should be able to forget about the desire to bring Messi back, they have been able to play well without Messi. Barcelona must pay attention to focus on getting new players who have good skills with those who are much younger. however, the Messi era is almost ended becaus of his age. If Barcelona insist on signing Messi and sacrifice financial problems, I think the Club will have more serious financial problems. After all, if Messi wants to support the club, he should be willing to be paid cheaply even though he is currently a star player.