Islam Makhatchev had staphylococcus. He was at a fever for a week two weeks before the fight. That’s why he didn’t finish earlier, because he was still taking antibiotics and had less muscle mass. Islam did not complain, only after the fight a journalist from the UFC began to interrogate him and he confessed.
BSD was sick, on antibiotics because of staphylococcus... To hope to win against Poirier, BSD would have had to be at 100% of his physical capabilities!