Ajay Devgan and Kangna Ranaut developed a close compatibility with each other on the professional and personal levels during their shooting of ‘Once Upon a Time in Mumbai’, so much so that Ajay emphasized on repeatin Kangna for the sequel of the blockbuster even when his friend Rohit Shetty wanted Kareena Kapoor or a fresh face for the female lead in the film.However, for reasons unknown Devgan