User blog comment:B214/Volume 22 spoilers/@comment-28087053-20170114184806/@comment-26821288-20170124215746

Nah, Indra is most likely not as strong as Ddraig and Albion. Don't forget, the strongest beings in DxD are Dragons. The Gods are the second strongest beings. And also, when Ishibumi gave his Top 10 Strongest Beings in the DxD universe list, he clearly said unordered, meaning anyone could be anywhere. So the fact that Indra is there, too, doesn't mean a lot. It's not really known who is stronger, it's not really clear. But I think that Ddraig and Albion are stronger. Mainly since Dragons are the strogest beings in DxD.