The key to defeating Kanaka will be Kazuya giving Azami a true name
Kazuya very conspicuously did not give Azami a true name and knowing a Tsugumomo's true name is the key to their partnership. If Kazuya can give her a true name that means she will become his partner and severely weaken Kanaka enough to defeat her
Kazuya's ability to support and revive the Mayoiga Tsugumomo will eventually allow him to revive Kiriha
He has so far shown the ability to bring them back from the brink of dissolution and has shown the ability to create Tsugumomo as well as Amasogi. If there's anyone who can revive a dead Tsugumomo it's Kazuya.- Confirmed: One of the Mayoiga Tsukumogami resews Kiriha, and Kazuya's power allows her to come back. He also brings back Kyouka a couple of chapters later.
Fox mask is Chisato
Just trying to guess someone we (the audience) know well enough to keep their identity concealed for it to be a surprise and Chisato's the only one I can think of.- Jossed as of chapter 101, is actually Sunao.
Kazuya's actually the reincarnation of the kami of the land that Mayoiga originally killed and stole the stone shard from
And his willingness to so quickly forgive both Tsukumogami and humans who attack him but are shown to be repentant afterwards is because he still somewhere in his heart has the feelings of regret over not being able to help Mayoiga, as well as the desire to continue on protecting both people and Tsukumogami.