User blog comment:LuffyPirateKing/Luffy and his belly/@comment-3387274-20121027140854

Ok, let's look at this rationally.

it would be reasonable to assume that BB wanted the Yami Yami no Mi because it would let him absorb multiple DFs. It's property is extreme gravitation, so if he absorbed several DFs it's possible he literally can't Expload because the inwards force holding his body together is so much greater.

Luffy, on the other hand, can't cope with Shockwaves; Impact dials, Rokugan, and other cases are proof. so if he ate another DF, the shocwave would still happen, unlike BB where it cannot get started. And it would kill him, even if his stomach stayed ruberised and pulled itself back.

So, logicly, NO.

And also plotwise, Blackbeard is effectively breaking all the rules and claiming an unfair advantage. if Luffy had to do the same to win, then what's the point? it would be much more meaningful if Luffy could overcome BB just by shear force of ambition. So NO there as well.