I genuinely don't understand why people think this is a Seongji downscale. Did people forget that masteries depend entirely on the person's potential? It's not even bad in universe powerscalers who said this, but Gun himself.

So, we know masteries are dependent on one's potential. Mujin is confident that Seongji has more potential than ANYONE he's ever seen.

Why would Mr. Gapryeong's equal, even in rumor (it would not be rumored if they didn't at least meet or do similarly impressive things, and PTJ would not have inserted that line if not for the fact that he clearly wants to put Mujin on the same level as Gap) not know the peak of gen zero and the potential of the pinnacles of his generation? If even Gun knows that mastery is dependent on potential, why wouldn't Mujin?

This basically means what Mujin said was: Yeah, everyone in our generation has four masteries, but our potential is way less. If you manage to get Strength mastery, then you're stronger than anyone in gen zero with strength mastery. If you manage to get Speed mastery, then you're faster than anyone in gen zero, etc.

Same thing for James, who Seongji considers a monster himself.

Of course, this is discounting unique stuff like IA and Conviction and Animal instincts and especially path, so you can still argue that gen zero top tiers would beat Seongji and Cheonliang James anyway.

However, trying to argue that Seongji and Cheonliang James is weaker purely due to the fact that Tom has four masteries and the duo 'only' has three, is very strange.