I ain't got no dog in this fight, but...it changed everything in my opinion. And I can even source AJ's own words to back that up.
That 1st round Breazeale KO played a huge psychological game on Joshua's mental getting up for that Ruiz fight. Matter of fact, he said in an interview that
he hoped it would take Wilder longer to get Breazeale out of there and when it didn't he said later that he had that
Breazeale KO on his mind the night of his fight with Ruiz. That shit affected him some way. lol
Like you I don't agree with the triangle theory in boxing too but aside from all them other comparable wins, what Deontay did to Breazeale and how he did it affected him a magnitude order higher than any other comparable wins mentioned above.