This time the Sena chief is a 100% correct. You cannot separate Bangalore from Karnataka, Chennai from Tamil Nadu or Mumbai from Maharashtra.
It is the magnanimity of the local people (say Marathis in Mumbai and Kannadigas in Bangalore) and the hardwork of all the settlers that is responsible for the two cities in becoming such big cosmopolitan cities.
How can one even think of separation , let alone discuss the issue?
If the comparison is with the National Capital Region or Delhi, i guess anybody truly Indian would realise the nature of separate statehood for Delhi because Delhi does not belong to Punjab,UP or Haryana.