different about Teach's body that could explain how he gained a second devil fruit power, something normally impossible for an ordinary person. The Will of the D does not factor into this, Whitebeard himself noted that Teach did not possess the Will of the D.
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Teach's yami yami mi has the known ability to negate the abilities of other devil fruit. The ability to extract devil fruit abilities from other users would not be outside the already established scope of his fruit's power. Having extracted their ability, Teach could have found a technique whereby he absorbs the stolen power. Had the yami yami no mi come into the possession of another, this would not have been possible. But with his unique body, Teach is able to overcome the boundaries normally faced by devil fruit users.
Don't forget that Vegapunk learned how to give devil fruit powers to inanimate objects. Caesar was a former colleague of Vegapunk, and must have learned the technique from him. Poison gas is an inanimate object, and Caesar clearly gave it a devil fruit power. He must also have learned how to extract devil fruit powers from an inanimate object. The candy was probably a chemical capable of extracting Smiley's devil fruit power. That would mean the apples were brought as a medium on which to deposit Smiley's DF power. There is not necessarily any connection between this and Blackbeard's method for extracting devil fruit powers. It is possible Blackbeard uses his yami yami no mi, while it is almost certain that Caesar developed his technique from his time working with Vegapunk.
Smiley had the sara sara no mi devil fruit, an axolotl zoan. There is no slimey fruit.
Did Blackbeard know that if a devil fruit user dies and there is a fruit nearby it will become a devil fruit as shown in chapter 676. As he has an atypical body like Marco stated in chapter http://www.mangareader.net/103-48079...apter-577.htmlhe was able to eat the reborn Gura Gura no Mi fruit and gain its power.