In a 2007 paper Nukulin and Polukhin surmised from electrodynamical considerations that, for megajoule dense plasma focus devices, focus currents and neutron yield Y n saturate as the capacitor energy E 0 is increased by increasing the capacitance C 0. In contrast, our numerical experiments show no saturation; both pinch currents and Y n continue to rise with C 0 although at a slower rate than at lower energies. The difference in results is explained. The Nukulin and Polukhin assumption that the tube inductance and length are proportional to C 0 is contrary to laboratory as well as numerical experiments. Conditions to achieve Y n of 10 13 in a deuterium plasma focus are found from our numerical experiments, at a storage energy of 3 MJ with a circuit peak current of 7.6 MA and focus pinch current of 2.5 MA.