Viñales being in his tenth season in MotoGP probably wanted to be the main protagonist in a factory team's storyline. For the first and only time. Then Aprilia got hold of a World Champion. I understand why he had a mental breakdown, and jumped ship. Add that his bike has been nearing the Japanese bikes and not the other Italian brand for the last year, another factory contract with probably a better financial deal, isn't a bad call. These lads have big egos, and they are not prepared to be the wingman for their entire stint in the top class, if they can win races.