User blog comment:B214/Volume 22 spoilers/@comment-201.215.165.7-20170213165134/@comment-1359322-20170215002615

Never said Ise isn't a Devil but Ise isn't a Pure-blooded Devil. Keyword: BLOOD.

The blood flowing in his body isn't a pure Devil's blood. It's a human/Dragon blood. So Ise is a Reincarnated Devil but he and his children won't be Pure-blooded Devils. They will still be Half-blood or Reincarnated Devils in the end because their blood isn't Pure Devil origin.