User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-8.28.150.75-20140210041712/@comment-8.28.150.75-20140211161231

That maybe true but ddraig did say his current body was better then his last and issei mentoned wanting to improve his body further since he had more potential being a part of the two strongest dragons. I imagine since he is techniquely a dragon now he SHOULD have more potential dont you think?