Jesus plainly teaches them the fact that John the Baptist is indeed the fulfillment of the prophecy of the "return" of Elijah.
But now is Christ risen from the dead, and become the firstfruits of them that slept.
No man, or organization of men, has the authority to ignore scripture when speaking in God's name.
By the work of Jesus alone that we are saved.
In this, we get a glimpse at the sovereign right of God to do things as He wills. Our will, desires, or plans are sometimes considered by God. But in any case, God has the right to do things however He wants to. After, He is God!
Transfigure is certainly not a word we use everyday! But it is perhaps one of the most precious words we have in the English language. It tells of the moment that Jesus showed men just a little bit of His glory!