Is he sure it wasn’t a donkey’s colt?
In this world, on that first Palm Sunday, yes Jesus did ride a donkey’s colt in humility as the Savior of the world. Now in the glory of Heaven, I would assume Jesus would be riding on a horse as the Great King of Kings.
That was the first time coming. Second coming, Jesus Christ comes as the conquering Messiah on a white horse:
Revelation 19:
11 Now I saw heaven opened, and behold, a white horse. And He who sat on him was called Faithful and True, and in righteousness He judges and makes war. 12 His eyes were like a flame of fire, and on His head were many crowns. He had a name written that no one knew except Himself. 13 He was clothed with a robe dipped in blood, and His name is called The Word of God. 14 And the armies in heaven, clothed in fine linen, white and clean, followed Him on white horses. 15 Now out of His mouth goes a sharp sword, that with it He should strike the nations. And He Himself will rule them with a rod of iron. He Himself treads the winepress of the fierceness and wrath of Almighty God. 16 And He has on His robe and on His thigh a name written:
KING OF KINGS AND LORD OF LORDS.