User blog comment:Crimson and Darkness/Shin DxD 3 discussion/@comment-96.80.121.166-20190821152610/@comment-10330822-20190823005725

It still might. Ryuuteimaru is indeed part of the large-scale form, but no one said it "had" to be. It's possible Issei could possibly perform the same move with Ddraig in the future.