In fact, we can understand what Xavi is like as a coach by seeing Barca's progress. As he is a former legend of Barca, he wants Barca to play like before. And he also knows how important Messi is to Barca. That's why he might want to bring Messi back to Barca next season. Whether Messi will come to Barca now is a personal matter for him. Hopefully we will see Messi again at Barca.
We don't deny that what Xavi is doing in barcelona right now is extraordinary, he managed to re-develop and raise the level of barcelona that had previously fallen, the closeness of messi and barcelona I think is still well maintained and maybe it will be easy for Xavi to convince Messi to return to Barcelona because after all Barcelona is the home of messi, besides Messi bad relationship with Mbappe can certainly be a trigger Messi to leave next season, especially Messi is currently reluctant to extend his contract which only has one year left.