Wait what? Has it always been like that? Because this is the first time I'm hearing this, and it honestly seems stupid. Where was this stated?
I mean, that doesn't really seem that impressive when Jin himself dodged attacks that were compared to thunderstorms, stating:
"Common sense told Seo Mu-Sang that this was impossible. Just as a human cannot run through a thunderstorm without getting wet, there was no way Jin Mu-Won could dash through that rain of death without being hit.
And yet, the impossible was happening right now, right in front of hi m."
Jin dodged absolutely everything here, while getting slowed, and his internal organs damaged, and protecting someone on his back, and a single attack would outright kill him.
Absolutely not. Dekus definitely a martial art master, and I doubt anyone in MHA is.
The dude Jin went toe to toe with and dodged everything was a martial art master that defeated another martial artist, whom have also defeated 100 martial artists, many of them being masters.
And the dude who defeated those 100 martial artists was stated to be a prodigy, being able to master new martial arts in a very short timeframe.
To put perspective into how skilled the dudes in legend of the northern blade are:
Martial artists start training by the time they 6 to 7 years old.
Mu-sang, a normal martial artist guard, whom have mastered a martial arts that was deemed weak, has been absolutely foddered by another martial artist to the point he couldn't even touch the seams of his clothes.
After only a month of training, the dudes martial arts Improved so much that it was stated he was incomparable to a few days ago, and it was specifically stated that his martial arts was improved, as well as his strength.
The dude believed he could go toe to toe with the guy that previously fodderized him.
Ans Jins potential is so much higher than this dude, that Mu sang literally got on his knees and called him lord after seeing his fight against Tae Mu Kang (The martial art master that Jin dodged every attack)
I'm also not bringing up the fact that the dude Jin fought could also have his own analytic prediction stuff, since the scan stated that any experienced martial artist would be able to gain the ability to see your next move. Though, it's best to disregard this stuff until new novel chapters come and confirm this.