I don't get what this means.
Are you asking why Madara's Susanoo has four arms? Well, that's probably due to a user's Susanoo forming differently. E.g. Sasuke has a bow+arrow whilst none of others do. And Itachi has spirit weapons, whilst the others don't. That would explain the 4 arms, which is the only stark difference in their Susanoo
Facial characteristics are unimportant, and the colour is trivial too, for those are also probably unique manifestations.
What is important is the outer appearance of the torso or body. Most Susanoo have a sort of amour and appear thick. Their ribcages are also invisible and they skin or limbs and almost sort of a cap over their heads.
Look at this for example, and where it say "final Susanoo" for each user, Madara's was clearly not at that stage. And when I say complete, I mean in it's last form or final form.
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I didn't claim to know more than people. I'm only saying that most people have misunderstood the functioning of Susanoo, and I'm simply trying to correct them. It's get difficult when most people aren't fair or open-minded, it makes it difficult to explain to them, hence the making of this thread.
You're the very first person I'm going to laugh at.
Can't wait.