Spot on. The level of opposition plays BIG role in KO percentage. Look at Floyd's resume. First 15 opponents of Floyd's pro career were tomato cans. He went 15-0 with 13 KOs against them. After that he scored just 14 stoppage wins in 35 total wins (and let's be honest, some of these KOs were cheap shot against glass-jawed Ortiz, and another - against non-competent pro debutant Conor McGregor). So that leaves Floyd with just 12 KOs or TKOs in 30+ fights against decent or high-level opponents. And when he moved to 147, Floyd scored just 3 KOs in 15 fights (and only real KO over high-ranked opponent was against Hatton (debutant Conor and cheap-shotted Ortis don't count as quality KOs).