Paleontologist stephen jay gould has stated that “mankind stood up first and got smart later.” what evidence supports that statement?

The research stated that hominids walked on two feets, for at leat 2 million of years without their brain getting any larger.
Based on this, Stephen Jay Gould concludes that . The volume of the brain usually indicates the intellectual capacity of that organism. 

Dna transcription:
after the transcription of mrna from dna the mrna needs to exit the nucleus and enter the cytoplasm where it will be translated to form protein. the transcribed mrna exits the nuclear membrane via nuclear pores interspersed through out the membrane.
synthesis of proteins:
after the mrna exits the nucleus via the nuclear pores in the nuclear membrane it undergoes the process of translation.  a lot of the ribosomes responsible for the process of protein synthesis are membrane bound on the rough endoplasmic reticulum where the protein undergoes post translational modifications and additions