User blog comment:B214/Volume 23 discussion blog/@comment-185.112.105.215-20170507194446/@comment-187.15.241.223-20170507222929

When the indra team is likely to be watching issei then the draig can talk to him about the power of indra and tell if he is weaker or stronger than he is but by then we can only theorize about who is stronger (Unless you know the ichei ishibumi and ask for it), I personally think Indra is stronger than the two celestial dragons in their original state.