The ding –dong between former President Olusegun Obasanjo and NNPC Limited (NNPCL) is good, disturbing as it may seem on the surface. It is a buckle-up clarion call to NNPCL. The nation has suffered enough in its hands. The argument that may be seen as degenerating into a brickbat is still over the state of the refineries. NNPCL’s Group Chief …