The Chosens One
Recultivating does not alway mean an increase in strength, but the people who can actively choose to do so are usually the determining kind. After all, how many people can abandon all their years of cultivation, turning themselves into weak mortals? If something goes wrong, they do not have ways to protect themselves.
So, the fact that Jingwu Hua walked that path showed, at the very least, that she is a person of strong Will. People who can survive the sealing process to wash away their karma are people with high-level Dao Hearts, so Jingwu Hua's achievements are not that abnormal logically.
After checking her out, Wang Wei focused on someone else: Mo Xingyun. He had suspicions about her since he knew that Devouring Dao was an outlaw, but she seemed perfectly fine, without the outlaw aura or the need to undergo the trial.