(Timestamped) Just another person saying the truth that GSP haters still to this day want to deny , GSP's biggest reason for leaving the sport was the lack of stricter drug testing in UFC as evidenced by GSP himself any many people. GSP being clean and enrolled into strict drug-testing programs while his opponents being not meant also meant a very unfair advantage for his opponents , a very unfair advantage which he battled since the beggining of his career and still managed to beat every man he's face. GSP was paying VADA out of his own pocket to prove that he is clean and pressure UFC into implementing stricter drug-testing, Sad that Hendricks wouldnt accept to do the same leading up to Hendricks defeat at the hands of the GOAT. GSP is one of the first advocates for stricter drug testing in MMA and we can even go as far as calling him one of the fathers of stricter-drug testing in MMA , he showed that even while being natural you can still go on to become the greatest fighter the sport has ever seen while defeating multiple PED cheaters in their prime during your way. Never failed a test despite being only a year and a half out of strict drug-testing pool since 2013 , Truly the GOAT , Cant say the same for some other fighters. John Wayne-Parr was a sparring partner of GSP during the Hendricks camp(For the first two weeks of the camp) so he apparently is very aware of how fustrated GSP was with UFC and Hendricks refusing to implement stricter drug-testing for GSP-Hendricks fight.