prince of zamunda
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Here Itachi is seen with Susanoo activated but no MS nor sharingan in his eyes.
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Here Madara is seen with Susanoo activated but with rinnegan.
I think Susanoo is some form of izanami where the user takes their imagination/spiritual form and then administers physical/vitality energy to Susanno. This is why Susanoo looks different depending on the user's imagination/spiritual form. Tsukuyomi= imagination + spritual Amaterasu= physical + vitality you must have both techs in order to use Susanoo. I think once activating MS you can use Susanno without MS being turned on.
I don't have any valid proof this is just a thought i had when looking at Iatchi's eyes when he used Susanoo on Sasuke. You could argue he was going blind but if his eyes lost it's light then how was he able to use MS tech Susanoo