San Miyairi and Gu Qingqiu, as long as they don't die, can definitely reach Dragon Level.
Their greatest advantage is that they can remain calm, carefully observe, and make the right response in any situation that might lead to death.
Hua Yue Yu and Kim Myungjin are too panicked, although they can overcome this through training, their upper limit won't be too high. Even if Lin Baici provides them with a large amount of Meteorite and Taboo things, and takes them exploring in God's ruins to accumulate experience, reaching Dragon Level would be their ceiling.
To put it bluntly, they are trained, whereas Sakura Girl and Gu Qingqiu have high natural talents and can grow naturally.
As the surrounding bloody mist begins to disperse, San Miyairi relaxes her tense nerves a lot, with enough leisure to tease Hua Yue Yu and gather some intel on Lin Baici.
