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.
The problem is whether Barcelona can afford his salary. Xavi looks forcing it, it is against the decision of Barcelona management. Remember when Messi left he even cried but Barcelona didn't understand that. I don't know, but the salary issue is an agreed obligation. Talking about loyalty nowadays it seems money is the most important thing. I don't know if Messi still wants to or maybe he's already hurt.