even GNT is near to BZA div but it has very diff route KMS
if GNT div is not there it need to share route kms to SC div,BZA div and GTL div.
Of total 7K kms in SCR
SC- 2073kms
BZA...
more... - 1626
GTL - 1865
Gnt - 648
HYB - 594
NED - 998
If gnt div not there the load increases on SC,BZA and GTL.
But any way IR says every zones are clasified of operational feasibilty, and every zone need not earn porfits has onw limitations like geographical factor.