Akainu high difficulty. We haven't seen what Blackbeard's skill with Gura is yet. Based on what we've seen, Akainu leaves alive, BB does not.
Blackbeard wins
(if he also has the yami fruit)
blackbeard takes this high diff the scumbag
Blackbeard wins this
Oh, that hax devil fruit power of his:devil:
Blackbeard ROFL stomps Akainu.
Blackbeard
if Whitebeard owned akianu with his single Fruit
then Blackbeard will shitstomps Akaianu with 2 Powerful devil fruits