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The sage says clearly that she possesses the Byakugan and the power of Sharingan, he doesn't say anything about Rinnegan.
Kaguya possesses the Rinne Sharingan which is a form of Sharingan just like Mangekyou Sharingan, all it's jutsus has nothing to do with Six Paths Jutsu, her son Hagoromo got it because she ****ed an Otsutsuki that has Rinnegan like Momoshiki and because of Kaguya's chakra his Rinnegan was stronger than his father, Momoshiki's Rinnegan got stronger when he absorbed kinshiki.
Ribbit Juubi(Kaguyas chakra) doesn't have Rinnegan when he have 2 free eyes for them because Rinnegan is a Kekkei Mora and it's way beyond bloodline limit.
The reason is this:
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If Kishimoto doesn't know how to kill Madara then he turns him into Kaguya that means Madara > Kaguya
Reasnon 1:
Shinra Tensei:
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If Kaguya can do this she can't be sealed.
Reasnon 2:
Preta Path:
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If Kaguya had this she would already absorbed all Sasuke's and Naruto's chakra like how pain did it with Sage Mode Naruto.
Reason 3:
Human Path:
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Reasnon 4:
Outer Path:
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And more.
Final Conclusion:
Kaguya sucks and Madara is way more powerful than that retarded fodder.