User blog comment:Godisme/The Extinction/@comment-1535822-20121002150209

i think is different they can't copy the apparence but why they become quincy they use the reishi to simulate the apparence (like a disguise make of reishi) we already see Quilge Opie absorb reishi of other people and fusing with it so if in soul society all is make with reishi they can manipolate reishi to create a kind of reishi armorn in the form of a person.