I think DD can beat aokiji.
REASON
Since he is the strongest of all the warlords, so he can beat mihawk who just lost to shanks by a small margin. And shanks can beat an admiral easily. So DD can also beat aokiji. And also aokiji has many injuries due to his fight with akainu, so he has become weak.
REASON
Since he is the strongest of all the warlords, so he can beat mihawk who just lost to shanks by a small margin. And shanks can beat an admiral easily. So DD can also beat aokiji. And also aokiji has many injuries due to his fight with akainu, so he has become weak.