User blog comment:B214/High School DxD Hero Discussion/@comment-73.57.25.92-20180621223819/@comment-2601:8C:601:5692:2540:112E:DFCE:A98C-20180628042719

Well, if you look carefully at the communications circle that appears before Lady Phoenix appears (in an earlier episode), the symbol was a stylized/fancy 'P' instead of the already-established Phoenix symbol from previous seasons. I was surprised the Gremory symbol didn't become a 'G', but I guess it was too well known. Anyways, you're correct that they should have tried not to contradict the LN. They could have at least found a way to make the 'B' out of the flower...