User blog comment:B214/Question and Answers 6/@comment-190.164.227.239-20161201033222/@comment-9595671-20161205225549

I can agree with Ddraig sounding teasing, last time I recall him saying it, he was telling Euclid that even if he could draw out more power without the additions Issei's obtained, Issei is a better wielder and doesn't treat him like a tool even if he causes him some troubles.

I was even kinda hoping he would also say "And even then, he has something more that will make him become stronger than you ever could. You may be strong, but Issei has the true heart of a dragon!" That would have sounded cool.