Just to clear up some stuff, there seems to be a lot of ignorance about what exactly the meet the videos use and what they don't use.
The only changes made for meet the vids are the morph facial textures.
As the pyro has no face, why the fuck would they have morph's for him?
Oh, that's right. They don't.
Furthermore: the morphs they do have exactly the same resolution as the other facial textures.
The models are not higher poly. The textures are not higher res. They are the exact same models as you see in game.
The only difference is they have a stretch and compress texure, when the facial features are morphed towards either extreme they blend towards the corresponding extreme's texture.
(the compress texture, it has darker teeth and tongue, as well as wrinkles around the eyes and between the eyebrows. the stretch texture has a lighter tongue and teeth with shadows at the sides of the mouth and furrows in the forehead, the rest of the texture is exactly the same)
The only reason they would adjust the model is if they remove the mask.