Quote Originally Posted by MasterE View Post
Going single weapon would only increase the soul's attack. You would improve your hime's power and survivability by keeping their favored weapons on hand, too.
Looking at the formulas on the JP wiki page, Souls get an attack AND HP boost from having their specialized weapons equiped as sub-weapons. Kamihime only get an attack boost, so it's actually the opposite of what you've said here.

Quote Originally Posted by MasterE View Post
EDIT: Btw, if you're having trouble understanding the translation, you don't have to speculate, go ask on the discord chat (https://discord.gg/3tZtUBE). Players have been there since the dmm version, which means they have more credibility than if they were authenticated by nutaku.
The Discord chat is fast-moving and spammed up with chatter. Many questions get ignored in the sea of chatter, and the answers will get missed by most anyway. Forums are the place to hold these topical discussions. Important info will get further summarized into easily-readable FAQs as it's verified.