User blog comment:B214/Volume 23 discussion blog/@comment-76.175.162.45-20170402043409/@comment-120.188.1.76-20170402053506

For angel, Wings mean status. The more wings you have the more influence you have. In order to get more wings you need to acomplish some achievements, lineage is also considered but it is rarity.

For fallen angels, since most of them are angels who fell, they still have their wings when they were an angel (minus the colour) so that means FA like Azazel or Baragiel had a considerable status back in Heaven and they also have the same status in FA (rank of Cadre). Wings also mean status for FA, although not as strict as angel. Lineage is also considered and this method is the best way for FA to gain more manpower

For Devils, it's shown that only those who have Lucifer lineage have more than one pair of wings

For strength, I consider 4 great Seraph is as strong as The Old Maou at least.