Firstly, GWD-KRNT-DHNE is not congested in the day, the time when KSK passes through. Its congested only from the evenings till early morning. We are not talking about the VKB-WADI route at all here, all we are talking of is why KSK is better off running via KRNT! Oh and SC-GTL via VKB,WADI is not fully double technically and neither is it electrified!