I think the issue of capital structure is still an open question. The evidence on this is ambiguous. What exactly is your question? Excuse me but I did not fully understand your question.
The issue of Optimal Capital Structure (OCS) is an open question. There are good arguments on both sides. I think the issue of OCS depends on many factors, and there is no single answer.
Optimum Capital Structure,I suppose, cant be depicted as such.It is basically a relative concept based upon a number of factors like nature of industry,the phase of business cycle,the prevailing economic environment,the promoters stake,the guidelines by the regulator etc.