The main argument for Perfect Susanoo needing Rinnegan is that he used it while his Rinnegan was active.
But as you see in this scan he is using his Complete Susanoo in conjunction with Rinnegan.
So to say that Rinnegan is needed for Perfect Susanoo you have to say that it is also needed for Complete Susanoo, which we all know is not true.
But as you see in this scan he is using his Complete Susanoo in conjunction with Rinnegan.
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So to say that Rinnegan is needed for Perfect Susanoo you have to say that it is also needed for Complete Susanoo, which we all know is not true.