Usyk is hyman and he did got tired: this is how

I keep reading praises for Usyk's stamina but I saw clearly what was happening: 1. First few rounds Usyk's snap jabs and other shots kept Gassiev blind, he couldn't bear with Usyk's speed even though those shots couldn't KO him. In fact those shots could capitalize only to a certain amount after which Gassiev wouldn't slow down even further. It's like Head damage reached some amount after which only armor-piercing shots could damage Gas even further. 2. At Round 4 or around I noticed that Usyk's hand speed lowered from ideal to just good (and power was smaller as a lower pressure in running pipes) and that's when I was sure Gassiev got a chance to break Usyk down catching him with his heavy counters as Usyks stoppage power against Gas dropped down to almost 0. 3. But then Gassiev didn't use his time for good and in few rounds he could no more bear with Usyk's good hand speed. That's when Gas' level dropped one down too just as Usyk's ideal to good. 4. Rounds 8-12 Usyk had to use body shots because as stamina drained with time Gas still kept a chance of lucky punch (and hes punched Usyk's chin good for few times) yet Usyk did that just about only ONCE. So all-in-all we see that while Usyk's performance was breath taking it was still about 95% out of 100%. He had a flaw in technique by not using body shots at 2nd stage and his speed does deteriorate with rounds that there are few minutes when opponents can achieve success.