Naruto still has RSM.
Naruto's toad sage mode has dark pigmentations around his eyes -
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Naruto in the Gaiden still has those dark pigmentations when he uses toad sage mode -
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BSM/KSM is when Naruto combines BM/KM with toad sage mode. During those modes Naruto has the kurama eyes and toad sage mode eyes with the dark pigmentations -
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He used KSM during Naruto the Last.
RSM is when Naruto uses his Six path sage mode. He has kurama eyes and toad sage eyes, but no dark pigmentations. Those missing dark pigmentation is how us readers differentiate between BSM/KSM and RSM. He possess 2 variations of RSM. Base/non-chakra cloak RSM -
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and Full chakra cloak RSM -
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When Naruto uses Full chakra cloak RSM he has the rinnegan and 9 tomoe symbol on his back and the TSB.
In the gaiden Naruto activated RSM -
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- It is RSM because he doesn't have the dark pigmentation. Yes, he doesn't have his TSB or rinnegan and 9 tomoe symbol on his back either, but that's because he is not using full power (chakra cloak RSM). Instead, he was just using the 9 tails chakra to activate BM while in RSM. Yes, that's possible. It's similar to when he used the 4 tails chakra to created the LRS -
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- Naruto, in base RSM, just used the 4 tails charka. Regardless if he is in base or full RSM he is able to individually use the tail beast charka.
Why doesn't Naruto use his full RSM in the movie, don't know. It's probably the same reason other character don't use all of their power, because of plot. Naruto (manga) is notorious for characters using jutsu only once in the manga. Just like I have read anything about Sasuke using his other rinnegan powers. It appears the only rinnegan power he uses is his S/T jutsu.