He did clinch, but he didn't lock, which is the Golden Age style of clinching. His latching hand is very sticky. I think if you see the clinch style of Langsuan, who does this to the extreme, you'll see the element of clinch I'm talking about, where you use grabs to redirect and attack, and not to immobilize. But, you are very right, clinch is not the primary part of his game. And you are also right that it is very likely nobody ever fought like him, before or since. He'd be categorized as a Muay Sok fighter (and Elbow Fighter), but know that these categories aren't real. They are just very loose descriptors. He was maybe generally a Muay Khao fighter (knee fighter who derns) who also used elbows to pressure, and open up his knees. Karuhat once told us he wouldn't be worried about Yodkhunpon's elbows, he'd worry about his knees. It should also be said, even though we in the west love him, his style is I think considered a very "low" style in Thailand, denigrated and without a ton of appreciation. Even to this day he is vastly underrated in Thailand. It is full of art and creativity, and really beauty. But many Thais can or could not see it because of biases about kinds of fighting, a style that elbows very heavily, and is relentless. You can hear Yodkhupon talk a little about Samson Isaan, and why he made his Top 5 list. This is somewhat the story of Yodkhupon as well. Samson's Muay was also not appreciated in his day: