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There are many connections with Marshall D. Teach a.k.a. Blackbeard and Edward Teach, the real life Blackbeard (well, Oda has said that Edward Teach is one of his favorite pirates.)

Some of them are:
- Big size and brutal character
- blackbeard (obv.)
- Doesn't like salty food ( Teach's favorite food is pie.)
- Has many pistoles with him
- insults enemies

So, this leads the main thing what popped out:



If the Devil would be Gol D. Roger that phrase would be like this:



Blackbeard knows where One Piece is hidden!

If his age is twice than Ace's, he is somewhere is 40's.
So, It's possible that Gol D. Roger and Blackbeard have met, or even he could be in Gol D. Roger's ship.

I had my own theory, but it isn't related to this.
It's related to One Piece itself.
I think that One Piece is actually Ace, y'know...
coz technically Roger hid his treasure somewhere, and that treasure could be his son? since his son was 'hidden' inside of Rouge, yet to be born.
logical to me, but then again my theories suck ._.
I've had so many theories... from Moria and Kidd being related to what I just said.