Akainu wins at mid diff at best for the following reasons. He's a logia and Fujitori will not aid.
Literally the whole family besides Doflamingo, Peeka, Trevol (possibly), Vergo, and Monet can actually land attacks on Akainu.
The rest of the family will have futile efforts while being one-shotted with 0% effort.
So the really fight is between five people really in which the efforts and power the head officers are just laughable at best against Akainu.
Doflamingo on his own would get low diff by Akainu, that it's hardly even fair. Doffy who's shown some high level durability pals in comparison to Akainu getting smashed by earth quaking strikes by whitebeard.