This was a casual feat from a weaker Gap, this Gap was killed by both Kitae and James Lee. Now how the battle was split is really muddy, but since James and Kitae got stronger (through James getting Power Mastery and refining it with the help of Kitae, as for Kitae I assume at the very least he grew during his time in Mexico, but if not at the very least he's at the same level.)
For James, Seongji could be brought up as he fought at the very least a more refined James Lee (with 2 masteries) and ultimately brought out James' 3rd mastery. As for if Seongji could contend with this stronger James is another matter (I doubt it, but if the fight went on I could be proven wrong.)
James then says that his Cheonliang form (I assume post-power mastery refinement), would struggle in the fight between YUI Gun and UI Daniel. Of coursehe only says it, Watch Lee could be lying.
As for Elite, I think he was beaten by a weaker Gap (before Shingen showed up), but for Mujin I think he has narrative to Prime Gap (also I think James and Kitae killed Mujin as well since Kitae showed knowledge on Mujin's ssireum and how Vin Jin lacked the technique of it.) Also if Elite doesn't get it, Jinyeong doesn't get it since I think Elite whooped his butt.
I'll yap later if I have to.
Also I think Johan scales up here, yeah, the ridiculous Infinite Copy path.