(Do we know that Da Qing's encounter that made him immortal was with the complete set?)
It doesn't say so explicitly, but that was the impression I came away with, anyway. It's in the context of talking about all of the Hallows:
Ma Gui: 即使是我们也未能完全开发出圣器的全部效用。 当年大庆不小心触碰了圣器，似乎也受到了某些影响。 Even we can't fully exploit all of the powers of the Hallows. Da Qing touched the Hallows accidentally before; it looked like he was affected somehow.
Wouldn't Ma Gui would have said Da Qing touched one of them if that was the case?
no subject
It doesn't say so explicitly, but that was the impression I came away with, anyway. It's in the context of talking about all of the Hallows:
Ma Gui: 即使是我们也未能完全开发出圣器的全部效用。 当年大庆不小心触碰了圣器，似乎也受到了某些影响。
Even we can't fully exploit all of the powers of the Hallows. Da Qing touched the Hallows accidentally before; it looked like he was affected somehow.
Wouldn't Ma Gui would have said Da Qing touched one of them if that was the case?