Get your facts right. It was Karunanidhi who started worn on the project. Yediyurappa's was just a reaction to it.
Even after 60 years of India being independent and a majority of these year ruled by the Congress, we still see such issues between states. Who do you then blame for these issues, if not the Congress??? Was the Congress sleeping all these years? Why were so many such differences not settled in the 50 years of the Congress rule?? Did the Congress not have sufficient time of over 50 years of rule? Or was it the Congress gameplan to perpetuate such differences to remain in power???