User blog comment:Crimson and Darkness/Shin DxD 4 discussion/@comment-92.188.161.225-20200211115128/@comment-68.203.220.174-20200211153029

Issei has obvious reasons to fight Hades.

Angra has a reason to be interested in Vali, since he defeated his creation.

The only argument for Vali vs Hades is Lilith, but Vali never knew her. There is no familial love there.