Pacquiao's refusal of blood test is not a proof that he is on PED. He could have easily not have any PED in the Mayweather fight. He does not need it because of the fact the opponent have brittle hands. The problem with Pacquiao was, he played the Mayweather's game. More precisely the chicken game, where each of them refuse to yield to one another. It is Mayweather's game for the fact that he brought up the Olympic Blood Test.
What I cant understand is why "Legacy don't pay the bills!" Pacquiao Vs Mayweather fight surely pays the bills more than two fold. And if it was true that Pacquiao was on PED, it would not guarantee Pacquiao's win, but cause Pacquiao to be over confident and aggressive and must play in the wheelhouse of Mayweather's perfect shoulder roll defense. So it would not only pay the bills, but would also get Mayweater's legacy at the same time.