Theory Dragon vs Black Beard - The death of Black Beard

 Black Beard will be killed by Dragon or Bartholomew Kuma 100% 

Information about Black Beard : 

 Black Beard in One Piece was inspired by an ancient english pirate better known as Black Beard and his name is Edward Teach.    

 Black Beard was born in 1680 and died  in 1718 by Bartholomew Roberts.

Bartholomew Roberts : 

This is some informations about Bartholomew here : 

- He didn't drink alcohol 

- He was always clean-shaven

- he had an excellent hand writing 

Bartholomew Kuma : 

 Kuma is an enormous man. He is the tallest remaining Shichibukai and is usually seen carrying a Bible.

The only information I used in this theory is that Bartholomew kuma always carries with him a Bible in hand, showing that his personality was inspired by Bartholomew Roberts !

You can have more informations of this theory in this video :