User blog comment:Valeth/Demon King of the Sixth Heaven/@comment-25848535-20190519192503/@comment-27971189-20190520081342

Iskandar also like that, IIRC.

Ionian is EX but his stats listed it as A. IMO, NP on stats is referring to overall value like practical usage, effectiveness and combat value, things like that.

As his NP is technically just some kind of moral boost and the stats boost is given only firearms user and his loyal retainers, I consider it somewhat impractical, so maybe its D on overall value.