Go the character tab and click the 'skill' bubble on the hime. Those are what skills you're getting from your weapons. If it's not 10 total, then you're most likely losing potential skills.
For some content, the sheer amount of raw stats you get from weapons, eidolon and hime themselves with the addition of elemental bonus against the enemy may be enough, but that pathway is not recommended in this case. Since he's new and his SSR weapons will unlikely be break limited any soon since they're gacha.
With a basic set up of say something like 1 SSR weapon and 9 SR weapons, you can easily get over 80% assault from just getting each to sLv 10 and even further with more SSRs and sLv. Though in your case, I see 3 defender weapons, 2 of which I would honestly had not bothered to level at all.