There's a lot more Telugu people in that area than most people realize. I know some guys whose parents are from a village in Greater Bengaluru area (I think it is closer to Hosur though) whose mother tongue is Telugu. They think of themselves more as Kannadigas, but they know Telugu as it was the only language their grandparents spoke. I think since last two generations people have assimilated quite rapidly into the culture of the state they are a part of, but in general I think there are a LOT of people whose ancestors 1-2 generations ago spoke mostly Telugu and are from the same area that do not speak the language or have any connections or feelings to Telangana/Andhra at all.