User blog comment:B214/Question and Answers 3/@comment-86.81.216.93-20140725213226/@comment-24502975-20140726225456

Ophis is not out of the list. Ishibumi said that was the list of the top 10 before Ophis lost her powers, he never said it took her out of the top 10. If anything she is still the #1 most powerful being in DxD outside Great Red and Trihexa.

Also, the Heavenly Dragons would still be in the top 10. What does it matter that they haven't trained in thousands of years? They are still Heavenly Dragon-level, meaning they are above Gods.