User blog comment:B214/Volume 22 spoilers/@comment-95.90.227.198-20170204105622/@comment-31137559-20170204202841

It just sounds like everyone just wants Issei to become the most overpowered character ever. Does anyone have any patience? Issei is going to get there. Having him trained by someone will do what? How would Shiva train him? Just blast him and tell him to dodge. People just want hack atop of hacks for Issei. The only training Issei needs now is combat experience and time. No point wasting a lot of time trying to make Issei even more overpowered. Issei has achieved extraordinary growth in just one year. Why can't people just be content with that?