Not really. Styles make fights and everyone has a bad day at the office or under performs every now and then. That being said, if it's a fighter you dislike go in double hard and heavy on them for it.
GGG had a bad night against Canelo, and people are now acting like he's well past it. But I know it was only because he was fighting his huckleberry Canelo. If he continues on and fights someone else, GGG will look much better, like he did against Murata. You gotta understand, some fighters just get spooked when they are in the ring with someone that can hurt them. "It is not the same when you call for the lion than when you actually see him coming towards you." GGG acted tough when he called for the lion, but when the lion was coming towards him, all that tough talk turned to a cat's meow.
Rational boxing fans watched AJ quit against Ruiz Jr. in their first bout. When Joshua reclaimed the belts against a 300lb Andy, the mere mention of his prior loss was considered malevolent. Still, the rational boxing fan had drawn conclusions. When a fighter QUITS on their feet with something left to give, they will always quit again. Whether it be in a small way in the ring; not doing what is required to win and going through the motions, not digging deep in training, or not seeking out real challenges. There are certain ways in which a fighter can lose that are almost impossible to come back from. Getting SD'd by a slick southpaw is a common first loss. This is a styles thing more than an indicator of the future. A brutal knockout from a glancing blow, or an outright QUIT job? The fighter is branded.
You need to be flown over to and then parachuted into the roughest hood in Karaganda and beaten like a dog by some of the local toughs.
I thought exactly the same thing. "Well, maybe he can become an eight division champion, but if he's losing to journeymen like this, no way he will defeat Mayweather at welterweight."
That depends on many variables. On the fighters age The circumstances that caused him to have an “off night” or “bad night “ If he just got a new trainer , personal issues, etc. too many to list honestly.
Another issue is activity or lack of. If a fighter loses and a doesn't fight for a year, then that impression is around for quite a while. Then they have a fight, let's say a win, then not fight again for a year. They are 1-1 over a 2 year span. People draw conclusions from it because its all they have to go on sometimes. Same issue with people arguing over hypothetical matchups for years over 2 guys who are active in the same era but for whatever reason refuse to fight each other, because many fighters avoid each other fans try to draw conclusions from whatever info the have (no matter how limited)
It depends on many circumstances, including the styles in the match up, ages, stages in careers, etc. I would look at it, sure, but I may or may not give it much weight.