Throughout the cosmic evolution, currently believed cosmic ‘critical density’ can be shown to be a default result of the ‘positively curved’ light speed rotating black hole universe. As there is no observational or experimental evidence to Friedmann’s second assumption, the density classification scheme of Friedmann cosmology must be reviewed at fundamental level and possibly can be relinquished. The observed cosmic redshift can be reinterpreted as an index of ‘cosmological’ light emission mechanism. Clearly speaking, during cosmic evolution, as cosmic time increases, hydrogen atom emits photons with increased quanta of energy. Thus past light quanta emitted from old galaxy will have less energy and show a red shift with reference to our galaxy. Note that in 1947 Edwin Hubble himself thought for a new mechanism for understanding the observed galactic redshift data. By considering the ‘Planck mass’ as the initial mass of the baby cosmic black hole, initial physical and thermal parameters of the cosmic black hole can be defined and current physical and thermal parameters of the cosmic black hole can be fitted and understood. Uncertainty relation and all other microscopic physical constants play a crucial role in understanding the halt of the present cosmic expansion.