Board Thread:Questions and Answers/@comment-10952853-20130617015352/@comment-11051098-20130628172926

They are the Soul King's personal protectors for a reason. I think at least 2 of them can match Yama-jii's level, although in another way.

Yama-jii had the most powerful Bankai of them all, capable of destroying the Seireitei if active too long. he had an advantage there. But we don't know the Royal Guard's Bankais or skills yet.