In all those fights where the guys quit you could tell Lomachenko was starting to turn up the heat. Maybe they knew that a severe beating was on the way? It could also just be a coincidence that the guys he fought were all quitters. Floyd didn't really beat people up that much in his later fights with the notable exception of Hatton. Hatton was very frustrated in that fight which is why he clumsily lunged at Floyd and got check hooked to oblivion. He'd had been better off quitting.
I've read these far-fetched conspiracy theories and speculation as to why Loma's opponents are quitting. It was addressed at the Loma-Rigo press conference when a reporter (Fat Dan, actually) asked Loma why his last 4 consecutive opponents had quit on him between rounds. He
specifically asked if Loma was breaking them mentally
or physically, to which he replied, "both", as they're not mutually exclusive. It likely is a combination with the mental side being the primary key to it.
He starts by working on them mentally and, as you know, gradually increases the pace as the fight progresses. By the time he even starts to apply pressure consistently and impose any real degree of physicality, barring Sosa (who he beat the hell out of through accumulation) & Marriaga (who was bullied), they appear to have already checked out mentally. Two, arguably three of the Featherweights he fought also managed to find a way out against him so this really isn't "new". They did it during the fight instead of in between rounds; Jose Ramirez (debatable quit job), Gamalier Rodriguez (title defense) & Romulo Koasicha (his last title defense at Featherweight). The last two undoubtedly quit because they were that thoroughly outclassed and getting outpaced. These incidents weren't viewed as quit jobs
per se because it was so evident that they weren't top fighters anywhere near the level he was operating at the time.
Furthermore, a number of his own sparring partners
that he pays for work, naturally, are also being sent home early. Mark Kriegel from ESPN spent several weeks in Oxnard, California for Loma's last camp. This was
his personal account of how Loma's intense sparring sessions went down.
Fresh sparring partners rotate in every three rounds, unless, as occasionally happens, they're prematurely overwhelmed by the sheer volume of punches -- every single one recorded and calibrated through the computer chips in his hand wraps -- or beaten into submission.
In the past weeks, he has gone against champions and sent them home prematurely. He has been wrestled and low-blowed. He'll return a foul quickly, with clinical precision -- a right hook to the cup, followed by a right uppercut -- that leaves his opponent gasping and calling for time. But I never saw him angry or tense.
A father's touch: The relentless regimen of Vasyl Lomachenko