Difference in modal optimization between compliance index and frequency?

Hello. I noticed that Inspire will use minimize COMB response for modal optimization where maximize frequency (edit: stiffness) is selected as the objective. I see that COMB is defined as 

Is my understanding here correct?

• In a modal analysis, compliance will be zero since there are no forces applied.
• The natural frequencies are proportional to the square root of its eigenvalues.
• So with zero compliance, equal weighting, what we are essentially doing is maximizing the square of the sum of the frequencies of all modes requested. With 6 modes that would be:
  • objective = max(f1^2+f2^2+f3^2+f4^2+f5^2+f6^2)
• This approach may produce different results to that of maximizing frequency of first mode with FREQ resposne.

Thanks.