Materials vs. Texture Sets

I am modeling an ottoman, and need help interpreting the instructions, which say, "Amount of materials should be same as amount of texture sets."

Some info on the model:
My ottoman is one mesh, with a high-poly version baked onto a normal
map. The materials are a gray mottled leather with dark wood feet. I
have been provided only this texture...

1st question:
So, a "material" is the full node set-up, and a "texture" is any of the
maps or images used to plug in to that material's nodes (or just set on
the UV mapping). Is that correct? But, then, what is a "texture set"? I would think they mean the group of generated images or textural maps for each of the 9 materials they list here:

• Main textures:
  
  
  • BaseColor (sRGB)
  
  
  • AO (Linear)
  
  
  • Roughness (Linear)
  
  
  • Metalness (Linear)
  
  
  • Normal (RGB)
  
  
  • Opacity (Linear)
  
  
  • Emissive (sRGB)
  
  
  
  


• Additional textures: Glossiness, Specular

Here are the other relevant instructions:

• Single UV set per model, multiple textures sets if extra resolutions is needed


• Only square textures, 4096x4096 resolution


• Normal maps baked from hi-poly models


• Metalness & Specular workflow maps needed

...

What I would normally think to do in making a model like this is to
apply a material to each part (one for the leather, one for the feet),
then use a multi-noded setup for each one, including procedural texture
for the basecolor, the provided texture image for bump and light-related
maps (the baking of which I will be figuring out on the fly), the baked
normal map I have from the high-poly mesh, plus certain settings on the
Diffuse Shader.

It seems to me that this does not meet the following requirements:

Metalness & Specular workflow maps needed (This confuses
me anyway, as I've never really heard of using every single map, and I
thought Metalness & Specular were generally used one or the other.
Also, can you even bake a procedural color into a image map?)

Amount of materials should be same as amount of texture sets
(It seems like I will have 2 materials and something like 9 textures,
so what really differentiates a texture set from a material in this
context?)

Can someone set me straight, and maybe help me figure out the workflow here?