After being asked to investigate this situation (lol, cum investigator--actually, it's "Lieutenant")....
I come (pun, yes. A shitty one, yes) to the conclusion that this guy is pulling a fast one. Only a couple of differnet set-ups, vid after vid. All that blurry on-off. Some inexplicable time jumps, the fact that the glass seems to fill at a rate far exceeding the flow of the "cum". He's never really that hard when he's supposedly cumming big loads four times in four minutes.
I have no "proof" that it's bunk. But I maintain that it is.
But have fun with it, by all means.
I'm a huge fan of the Bond films, Star Wars. Etc. Fiction can be great.
I also noticed some of the things you mentioned, but guessed that the focus issues were simply caused by a camera with jumpy auto focus, because they just seem to happen when he is moving and don't seem to be hiding anything.
I didn't notice the video jumps you mentioned, because ALL the flash videos on xHamster are a little jumpy and jittery for me because xHamster loads up their pages with so many other spam video ads that my computer can't keep up.
I downloaded the flv files for some of the videos to check them in slow motion on VLC, and do see the missing frame jumps you mentioned, but I have seen similar issues with skipped frames due to old video capture cards dropping frames on old analog captures, or too-slow SD cards in more recent hardware, so I wouldn't make too much of that.
Someone earlier commented that he thought it was some kind of fake cum, and mentioned specifically that real cum has a certain unmistakable sticky clear and white texture that is not completely uniform.
Which is EXACTLY what this guys cum looks like in this vid -
Two Nice Big Sticky Loads In A Row
Check out the big blob of cum that gets stuck on the edge of the cup just after he pops the first time, and you will see it looks EXACTLY like cum, with EXACTLY the kind of sticky clear and white composition that was previously commented on as only being something you see in real cum.
Or check our this vid where he pops one of his huge loads in a condom and lets it drizzle out into a little medicine measuring cup.
Shooting one of my HUGE Loads In A Condom (special request)
I have seen maybe a dozen vids where some guy cums in a condom, and then he or someone else lets the cum drizzle out (usually into an open mouth), and I be damned if what is dripping out of this guys condom at the end doesn't look like the real thing.
If you Google for 'Zhuzha bukkake' or 'Zhuzha eats Sperm from a Condom' you can find a vid where this girl sucks off about 20 guys, one-by-one, letting them jerk their loads into her mouth, then saving their semen by spitting it into a condom. At the end of the vid she lays back and dumps the whole sticky mess, semen from about twenty guys, from the condom into her mouth, and you will see that, other than being slightly foamed up from her swishing it around in her mouth first, the semen has pretty much EXACTLY the same appearance as it does in this guy's xHamster vid.
There was a third fairly recent vid showing him cumming in a glass of coffee, and because of the clear glass you could see the way the cum broke up into thick gooey streamers and sinks to the bottom, and so far as I could tell this also looked exactly like the real thing (I would post the link, but it seems to have dropped off xHamster for some reason).
Like anyone who watches porn, I have seen my fair share of faked cum shots, but the fake cum wasn't anything like what you see in this guys videos. Sadly, the fake stuff just looked like some guy pissing buttermilk, or a girl with hand cream or yogurt dripping out of her mouth or pussy.
So if this guy
is faking it somehow, all I can say is that he should sell the secret to the porn industry, and started to manufacture his 'fake cum' commercially, because he could probably make a zillion bucks.