He's hardly a one-off given he is emulating a style an entire nation is known for. In Fedor Gorst's interview with Rogan, he mentioned how on his trip to the Philippines he was absolutely shocked with how good everyone was....everyone. Not just 'players' but any guy off the street could run a rack or 2 of 9ball, like the bartender who barely ever played that Fedor played against who ran 2 racks on him like it was nothing. That style def has its advantages. Speed control, effortless power, among them. If the delivery repeats, who cares what it looks like? Mika's mobile elbow didn't stop him from winning a World 9b, World 10b, and 2 US Opens. And I reiterate, he changed to that technique from a snooker style so at least in his view, this stroke was more advantageous than that.
While their style is to get around the table with max efficiency meaning they roll it whenever they can and try to let angles do the work, they can pound it when they need to as well. And given they are often playing on tables in barns that can be pretty slow (shout out to rando Filipino YouTube games), they definitely need the cue power to get around. A common feature of Filipino strokes is their effortless power. One of Efren's most famous shots is that one he hit "a million miles an hour" as Davenport called it on the commentary. And that wizzardry Efren routinely pulled off with the CB, def needed a powerful stroke.
I have heard the martial arts roots mentioned as well. But the martial arts base can be applied to styles beyond just the Filipino style as Max Eberle, when teaching Joe Rogan (a martial artist), explained the 'why' of mechanics to his student in his own language by showing him martial arts moves which translate well to pool strokes. The martial artists figured out efficient ways to use the arms. The execution of some are quite counter-intuitive. If you know what you're looking for, you see it. If you don't, the stroke just looks like it has a bunch of moving parts that don't need to be moving and you scratch your head wondering what the advantage to such a stroke is in the first place
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