I'll need a couple of minutes still to check out what I think you are saying, but this is very interesting indeed! Thanks for going back and forth with me!

I also just realized that in my original post, I made a comment about burst, and that when a Kamihime uses a burst, every other Kamihime that HASN'T attacked yet will get +10 to their bar. I just realized I am wrong. Every Kamihime who has not done a burst attack that turn so far will get +10, so I'll edit that first because I'm stuck in a raid battle atm haha :P

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ALRIGHT, you definitely got it right!

I used a different Eidolon this time, one with a passive that should not increase stats, and there was a 10% difference again. Is this a known thing or did you just figure that out? I had not seen it on the wiki, I think, but I may have just missed it. Whoops :x

Really great talk, I'll edit my post because I see where I messed up now. Unfortunately for me, my Kamihime/Eidolon collection is pretty bad so far, so the examples were too simple for me to understand what was going on, haha!