There it is. I was confused.
Not helped in my memory by the fact I used the phrase "to do a Kenshiro," in that thread.
It's Kid Goku, specifically from when he fought King Piccolo, he's Kenshiro's first match in the bracket.
I'm of the opinion that Kid Goku at that time isn't beyond Kenshiro's ability to takedown reliably. Speed bracket is still, if anything, in Kenshiro's favour. Goku hasn't gotten to the point where he's point and clicking small countries and such. Kenshiro really only needs to touch him and he has Musou Tensei and all that.