User blog comment:Stbk22/Possible Power up's/Techniques for then new group DxD/@comment-3965848-20140208111421/@comment-24331253-20140208122457

Yeah its just as B214 said and besides even if that were possible, the blood that Saji absorbed was when Issei was a devil reincarnated from a human body not now that he is a devil reincarnated from a dragon body.