Yeah, Shinobu’s actually a pretty cool tsukumogami to use. Kyouka’s cute, but I wasn’t really into her combat style, at least not as Kazuya’s main form of attack.
Considering his rapport with Kyouka, as well as the obvious team synergy Shinobu and Mimane have (Shinobu with Kiriha, I’m assuming), I wonder why exactly Kazuya contracted with the bowl girl (forgot her name). At least with the others, he’s got some prior relationship with them.