If the Incarnation begins at conception then the Annunciation is Christmas's actual content, nine months early. The Transfiguration only discloses what is already true.
Tabor shows the deified humanity that the Dormition then delivers to one person. Disclosure of the principle over its first instance.
Both are disclosures of divinity through a body, but the Jordan discloses it to the world and inaugurates the ministry; Tabor discloses it to three men and is not repeated.
Enthronement accomplished over enthronement foreshown.
Fifty-two Resurrections a year against one mountaintop. Frequency is not usually an argument, but constancy of witness is.