User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-1.186.102.252-20150720114500/@comment-3477384-20150720114845

I don't think so. We still have to see the drawbacks of Ophis's power, but i'm quite sure Issei won't be able to wield like the Scale Mail, only in the most dire situations.

And we know that even if Rizevim was a Super Devil, he was the weakest of the 3. And yeah, Issei defeated him, but not with his own power.

I will consider Issei a Super Devil, when he will be to show this kind of power on his own.