User blog comment:Crimson and Darkness/Volume 24 discussion blog/@comment-26926813-20171117050743/@comment-31137559-20171117055144

Wait. Was Crom Cruach arguing with Rias over something?

And that's to be expected. Crom Cruach is a power-type like Issei so of course they surpass Vali in attack power and defense. But Crom Cruach's wide gap in combat experience compared to Vali made the difference.