im just saying it is a plausible scenario because of his ideas differeing with naruto. and madara has been asking for sasukeh to join him because uchiha stick together and all that shit. so it fits the bill. just an idea
Sasuke already rejected madara in front of his face. And sasuke doesn't know too much about outside world and 'pain' which nagato, obito and madara learned. Sasuke cares about stuff related to konoha only