Director Aanand L Rai admits misjudging Shah Rukh Khan's persona in their 2018 film 'Zero'. He realized too late that the superstar's image needed to be integrated into the character, a crucial element he failed to incorporate. Rai confessed he was working with an actor, not fully accounting for the star power involved, leading to the film's box office disappointment.
source https://timesofindia.indiatimes.com/entertainment/hindi/bollywood/news/there-was-a-superstar-attached-i-realised-it-much-later-says-aanand-l-rai-about-shah-rukh-khan-as-he-opens-up-on-the-failure-of-zero/articleshow/125937871.cms
source https://timesofindia.indiatimes.com/entertainment/hindi/bollywood/news/there-was-a-superstar-attached-i-realised-it-much-later-says-aanand-l-rai-about-shah-rukh-khan-as-he-opens-up-on-the-failure-of-zero/articleshow/125937871.cms