Kurama and Mai are available as a package deal! Mai's shinki form grants her a healing light, so they'll probably be better for the initial ayakashi bomb or a dragon fight than the main event. That being said! Ideally I'd like to have another god/shinki pair along to deal the killing blow so I can put off Kurama's ongoing secret angst about the possible spiritual corruption of his shinki, but it's not an absolute requirement.