too bad, we only see a little of Kazuha story
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about the main series:
some idea pop up in my brain, thinking:
1.Valkrye stronger as Pandora with battery support
2.Valkrye intend to surpass Pandora
3.Valkrye can't stay too far from the battery
4.Almost all in team 13 have Kazuha's stigma in their body
...............
could it be that the Valkrye need Kazuya to surpass Pandoras because he will become 'mobile battery' for them?
Kazuya's stigmata is the most compatible with his sister's after all, and due to Gengo disapproval of Kazuya and member of El Bridgett family relationship, Ouka also sent to be 'replacement' of Kazuya partner (both in Battle and life)
let's hope this team 13 discord, didn't lead to guro scene Eva-01 show us, where each team 13 member, try to absorb (eat) the others Stigmata to gain more compatibility with Kazuya and reunite all Heroic Stigma in one body, and turn into 'super Valkrye'