I think this is going to happen a lot as people rewatch the fight, assuming they do so with an open mind. I think you might be able to discern this without even watching the fight if you read the forum. For example, initially some had the 7th round 10-9, but upon looking at it more closely, nobody is willing to stand by a 10-9 score. There's also the "what did Trout land?" thread. And sure enough, if you think back or rewatch, it's hard to find much. Those who say Trout won remain vague, pointing to overall business without addressing effectiveness, or claiming that Trout somehow "controlled the pace," while missing and being hit cleanly, even though he was often the one on the move. Well, to some extent. Apart from fanboys/trolls I think it's more just a case of people being influenced by their prejudice. If you aren't prepared to see something, it is harder to notice it. Many had Canelo marked down as a wide open, easy to hit plodder, so found it hard to absorb the opposite of that when they saw it. I expected Canelo to be skilled and accurate, but did not expect the upper body movement and D to be as sharp as it was. Even just being slightly wrong in my assessment, it took a while for what I was seeing to register.
I had Canelo by 2 rounds plus the knockdown. I wouldn't argue with anyone who had it Canelo by 1 round plus the knockdown. But I have a very strong feeling that if that fight had been in Vegas, the cards would have looked like the Showtime cards.