User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-92.21.29.42-20190623153730/@comment-29890029-20190624070926

My power level that I use : Low-class Devil, Middle-class Devil, High-class devil, Ultimate-class Devil, Maou-class Devil, Transcendental-level, Dragon God-level and ExE(or whatever that is above it like the final boss of 'E')

Sairaorg is not that far to Issei CxC. Sairaorg cant match DxD. Maou-class is probably his maximun.

Vali might reach Dragon God-level as stated by Ddraig. so both DxD God and DxD Lucifer will reach Dragon God-level. However, once Issei become a real Dragon God(third one after Ophis and GR), + achieves ExE, Vali will be weaker.

Kiba.... Maou-class maximun.

Saji still got a crappy human body.... his max should be Ultimate-class with the power of Vitra.

Riser.... He is still only a high-class devil. and he doesnt like to train very much.

Cao Cao will probably reach Transcendental-level.