All these forms of Wisdom Kings are just manifestations of Shiva! I mean, the iconography as well as all the epithets are all Shiva... riding on a bull, blue skin, wearing tiger pelt, garland of skulls. Even Trailokyavijaya 降三世(明王) was originally an epithet of Shiva, & that aspect of Shiva trampling "Shiva" & Parvati is in itself a symbol of one's victory over oneself (his own ego as well as his loved one/ partner). Tantric Buddhists & Yogis understand this but basic Buddhists then argue about whether all the 明王 & Buddhas are "better" or "more powerful" than Lord Shiva. LAWL.