User blog comment:B214/Question and Answers 3/@comment-86.81.216.93-20140725213226/@comment-24866657-20140726000622

Even if the Heavenly Dragons are unsealed they won't be in top 10 anymore, maybe in 11 to 20, it's amazing that people still treat them like powerful beings and god-killer type, mainly due to their abilities though.

It has been over thounsands of years iin DxDverse and the Heaven Dragons couldn't improve their strength because of the seal, so the other ones are now stronger than both Ddraig and Albion.