Nakamura was simply better at standup striking, notice how his right hand never left his face at all, he was wary of the left hook of reandleman.
Added to that nakamura tied him up real good on the bottom so that he couldn't g+p, and everytime that he did let go to punch, nakamura tried to scramble and get up.
Also nakamura has comparable takedown skills and in the clinch they seemed pretty equal with nakamura actually coming out on top when it came to takedowns.
Face facts gentlemen, nakamura was the better fighter skill wise, he may not be muscle bound but he is explosive as hell and a cardio machine.
He def. punched Bas in the face and then spent the rest of the majority of the fight with his face parked on top of Bas' chest.
That kinda is symbolic of his career; brief bursts of explosive performance surrounded by a sea of lacklusterness.
If Randleman was consistent in every other fight other than against his japanese opponents, then your work conspiracies might get more beef but you obviously havent seen them all.