(at 4:40)
"He was a Titan."
"He's a Hunter."
"He was a Titan but became a Hunter as Dredgen Yor."
"He wasn't any class."
I'm well aware of the debate over whether Azzir/Yor was a Titan or a Hunter. And that lately, people are leaning to the idea of him being a Titan... that might change now...
So as we should all know the subclass missions feature narrated lore straight from the Grimoire that have some connection to the subclass you're trying to get. In the Nightstalker mission, one of the "weird stories" told by Cayde alluded to Rezyl Azzir (time stamp shown above). Now Cayde is not much of a Nightstalker as he prefers his Golden Gun, so the Nightstalker connection isn't him. So perhaps Rezyl Azzir was in fact a Nightstalker? I get that there's evidence of him being a Titan; I just find it strange that the Hunter Vanguard is telling the story of a supposed Titan in a Nightstalker focused mission... unless he never was a Titan to begin with.
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He was a Titan, or at least Titan-like. Several of the snippets from subclass quests have little to do with the relevant subclass.