User blog comment:Crimson and Darkness/Shin DxD 3 discussion/@comment-36663391-20190820141719

Ryuuteimaru is part of AXA, maybe this could be caused by the fact that Issei was merged with Great Red in V.12, also Ryuuteimaru more continues to grow thanks his link twith Issei, so is not so strange after all he become his mecha and part of Issei's potentional or perhaps it would be better to say draconic arsenal...