If I remember the last picnic episode when Addu tells him to keep his promise i think he says something like 'now u should leave...all arrangements have been made...'
Quite possibly they had fixed that he would go off to Mumbai...then after the fall Mohan was saved and he decides to go away as originally planned to Mumbai...
Well these are all assumptions the truth will be revealed by he CVs...just hope its valid an also comes soon...