User blog comment:Yatanogarasu/What Did Blackbeard Do to Get the Gura Gura no Mi?/@comment-1734592-20110107011345

with Blackbeard's abilities, he could've absorbed the powers of the fruit (similar to how he sucked in that entire village) and releases through his abilities. In other words, he uses the Yami Yami as a storehouse for the Guro Guro