Origin of Huitzilopochtli
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Quetzalcoatl, born of a virgin; Uitzilopochtli (ball of feathers falls from heaven into his mother's breast).An Introduction to Mythology|Lewis Spence
To sum up: Uitzilopochtli was a derivative form or determination of the Sun, and specifically of the Sun of the fair season.
And this is why Tezcatlipoca, the god of the cold and dry season, rather than Uitzilopochtli, is his personal enemy.
Uitzilopochtli signifies Humming-bird to the left, from Uizilin (Humming-bird), and opochtli (to the left).
He must disappear and die with the god whom he represented, who must now make way for Uitzilopochtli.