User blog comment:B214/Light Novel Volume 16 spoilers/@comment-162.202.198.72-20131029215449/@comment-1359322-20131030094950

Ise's Dragon powers comes from Ddraig, but now that his body is of Great Red's flesh, it may come from himself eventually.Kinda doubtful if Issei can get Great Red and Ophis' powers. Since Ophis was greatly weakened when forming Issei's new body and Issei only having a very small portion of Great Red's flesh.