But he, Messi, made a major error in not asking to leave at what would have been the original end of the season (early May). He could have done that quietly and in private to the President. And told him he would continue until the end of the extended season but as soon as all of Barca's fixtures were complete, he would be leaving as a free agent.
What does that even mean, 'original end'? There were matches left to play, he was never going to abandon his teammates, the club or a competition he prioritizes so much in the CL
The error(s), from my POV, is having stuck with his father as his agent and assuming Bartomeu would fall based on the weight of his continued incompetence from socis. Can't fault him for trusting his father & his Barca family but they both failed him. His error is having gone with his heart rather than his head but that's largely why we love him