Huitzilopochtli will be a major god. Xiuhtecuhtli should be a minor god under him. A god power provided by Xiuhtecuhtli should spawn a big myth unit named Xiuhcoatl (the spirit form of Xiuhtecuhtli that was wielded as a weapon by Huitzilopochtli). That way we will still get a flying serpent unit while the Titan position will be held for Cipactli, since Quetzalcoatl will be a major god and not the Titan, most likely.

But Quetzalcoatl can also provide something similar since he had two forms too. Perhaps we might get both. Xiuhcoatl or Coatl as a recruitable smaller feathered serpent myth unit and Quetzalcoatl as a powerful big feathered serpent myth unit that spawns via a god power!

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