Messi unleashes an earthquake
Without Messi at Barcelona, the greats of Europe will go after him. This affects, for example, Griezmann, which aims to stay.
Also to Kane, who wants to leave, but perhaps her suitors will go after Leo.
Y Mbappe? If Messi signs for PSG, it would be unfeasible to keep the three (along with Neymar) in the squad,