I read this tgeory in a different forum:
"What if it's possible to eat one logia, one paramecia and one zoan fruit, you only die if you eat 2 of the same kind of fruit, and Blackbeard is just the only one to have figured this out =D" (constar90,reddit)
What do you guys think?
I dunno why you're posting this in the Anime section.
Try here.