Ok, this might sound crazy but hear me out. First off all this:
http://onepiece.wikia.com/wiki/SBS_Volume_48#Volume_48.2C_Chapter_467.2C_Page_166
In other words, there have been through history several individuals with a particular DF.
Now, lets take a look at this two moments:
http://www.onemanga.com/One_Piece/565.5/08/
http://www.onemanga.com/One_Piece/99/18/
http://www.onemanga.com/One_Piece/100/01/
http://www.onemanga.com/One_Piece/100/20/
Now, how much of a coincidence is it that roger was conveniently saved by a change in the weather and years later luffy got saved by it as dragon appeared? What if dragon got whatever fruit roger had after the guys death? On top of that a fruit like this would help against a fruit like WB's. What do you all think?
http://onepiece.wikia.com/wiki/SBS_Volume_48#Volume_48.2C_Chapter_467.2C_Page_166
In other words, there have been through history several individuals with a particular DF.
Now, lets take a look at this two moments:
http://www.onemanga.com/One_Piece/565.5/08/
http://www.onemanga.com/One_Piece/99/18/
http://www.onemanga.com/One_Piece/100/01/
http://www.onemanga.com/One_Piece/100/20/
Now, how much of a coincidence is it that roger was conveniently saved by a change in the weather and years later luffy got saved by it as dragon appeared? What if dragon got whatever fruit roger had after the guys death? On top of that a fruit like this would help against a fruit like WB's. What do you all think?

So the line exists