I do not think that is the case, if someone gets Nilou or Nahida (or even both) from the first bann...
Zakariya’s Prescription for Maruf
Name
Zakariya's Prescription for Maruf
Type (Ingame)
Quest Item
Rarity
Description
The words on this prescription resemble nothing so much as a serpentine dance. You can barely make out the phrases "Mint," "high flame," and "the herbs float."
i would even say r5 prototype is way better then r1 jade for either koko or baizhu