Dont know... but i saw akainu using his devil fruit power most of time and depending too much on it... but haki could counter that... maybe he's got stronger than before... but yet he's of no match to the other two
He is the fleet admiral! U think he is weak? He is really really strong! And he has a really nice haki! When vista and marco cut him using haki, nothing actually happens to him! And y not depend on a devil fruit which has no weakness! I cant think of a weakness for magma!