User blog comment:Blackbeardisawesome/luffy takes ace's powers?!/@comment-86.17.62.139-20100907131144

its not blackbeard that now holds the power of the gura gura no mii, it is the yami yami no mii that absorbed it.

Blackbeard still has only one devil in his body, but that devil is manifesting another in the gura gira no mii. that is something only the darkness fruit can do.