Oda doesn't have as much free time as you, nor is he as bored, as to analyze and draw in each of the small vignettes just the small speck of dust on Zoro's face with exact measurements and make a blackboard with arrows and circles like a mentally ill Lerkan.
I guess this is the first fight in the entire manga in which the characters have suffered damage and used their best off-panel attacks, cleaaaaaaaaarly
Also, in the image I posted which is the first crash, Zoro has more blood or dirt than in later chapters, making it clear that Oda is inconsistent and that this is simply a small detail that sometimes looks better and other times worse. Only a mentally ill person who wants to overanalyze every shadow, posture, etc. like you would give importance to trying to be right. Zoro fans don't have to invent or overanalyze some specks of dust, we simply put "1 attack>>> 3 attack". And we won