User blog comment:B214/Question and Answers/@comment-162.202.198.72-20130810085107/@comment-180.194.243.223-20130821225627

For the record, Shiva isn't th second most powerful being in Highschool DxD.

The list that was released was not the "TOP TEN MOST POWERFUL" but the "TEN MOST POWERFUL  ACCORDING TO VALI" (stated in the afterword of vol.13).

And that list is not in particular order.

Btw, that happened in vol.4 where Vali does not know how powerful Sirzechs and Ajuka are.

Also Great-Red is not included for the reason that he doesn't fight :(