Congress MP Revanth Reddy questions KCR's Bihar origins.
KCR's kurmi roots, migration from Bihar to Telangana.
Reddy's competition against KCR in Kodangal and Gajwel.
Shift in Congress prospects with key leaders returning.
Confidence in Congress's performance in upcoming elections.
YS Sharmila's support for Congress noted as a shift.
Congress predicts victory and a 'Prajala Telangana' government.