Rosella had set much information like special and secret abilities for them to inherit transmitted by soul, she used a Soul Spirit to do it. And that information is highly confidential, if someone had the ability to search for information in their souls, the information will be erased.
A King Soul Spirit is by no means weak. He is a Sacred Spirit and his abilities are beyond all this.
So, for a puppet doppelgänger, its weakness is not knowing the secrets the souls had.
And in their recollection of information, there's only one person who can make puppets doppelgängers. They've to inform Princess Rosella of their findings.
But before doing that…
"Number twelve. You can come clean, or do you want to make us do it?" Nana spoke.
She had to make time, the 'thing' Princess Rosella gave her in case of emergencies, needs at least two minutes to recharge.
"W… What… what are you talking about?" Number twelve feigns ignorance.