User blog comment:Crimson and Darkness/Shin DxD 4 discussion/@comment-172.58.203.99-20200219204057/@comment-40183495-20200220141806

It makes sense. Balberith is only a Super Devil due to his immense demonic power. Demonic power doesn't mean transcendent physical abilities, just transcendent magical abilities and the ability to increase the power of your blows. Sairaorg has trained since he was a child and reached the usage of Touki without Senjutsu training due to his sheer and intense physical training. He is also a wielder of a Longinus specialized in physical enhancement and defense, in addition to its earth-shaking striking power. As such, it makes sense if his punches can harm Balberith who can only rely on his aura to protect himself. In the end, Balberith is still a devil with a body of flesh, he can be tired, he can be wounded, and he can receive internal injuries. Even Sirzechs could be easily killed if impaled by a Holy Sword when caught off-guard, for example. In the end, defensive aura is good to increase defense against energy attacks and strengthen your defense/durability, but there is a limit except if you make solid aura (as the boosted gear's scale mail or regulus' armor) or magic. Balberith has more destructive power and magical reserve, but his battle experience, willpower and physical abilities are obviously inferior to Sairaorg as he is still a newborn. He is far of reaching his peak, as he can still progress. Even his reserve of demonic power can increase.