User blog comment:B214/Question and Answers 4/@comment-85.154.49.57-20141006111909/@comment-16281343-20141006112726

The Heavenly Dragons and Sirzechs are in the top 10. As to who's ranked higher or how much the difference is, we don't know.

Sirzechs may even be ranked higher than them, no one knows. But if he's lower and wants to reach that level, it's possible.