User blog comment:B214/General Discussion/@comment-27180505-20170331135923/@comment-120.188.7.245-20170401131230

Hmmm, From what i have read, i could assume that being dragonified by Ddraig makes him unable to control the dragonified body part. Issei's current body is from GR's flesh so if he dragonifies his body, he still could be able to control his dragonified body since it's still his own flesh.