I think Blazing provided a databook entry which says even base Naruto kicking TSB was RSM. So this mode should classify in RSM if that mode does. And it also rubbishes the theories that he lost RSM. If he can use a weaker version with Sage's chakra, he should be able to use a stronger version as well. Basically he has the choice to use or not to use Sage's chakra in any of his modes now.
that was not base naruto however,he had eyes of sage mode and bijuu mode combined...his great yang chakra boosted that mode a lot but it still wasnt the most powerful mode RSM which he activated seconds after my scan,however in this case i have to agree,this was RSM,however a powered down version without the cloak...
just like his rage mode without the cloak
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and his kyuubi rage mode with cloak
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but still today`s chapter was not the most powerful mode that is RSM as he is already using the cloak....the powered down version of RSM was that scan i first posted and today`s chapter one already has a cloak but unlike the RSM one so i dont believe it`s his most powerful mode...yet
Your scan is Naruto with RSM, but no chakra cloak.
RSM is Sage Mode using Six Paths senjutsu. He can use RSM in base, without a cloak. This is what allowed him to dodge Madara's Limbo before Sasuke arrived.
Naruto could combine his RSM with any other mode, just like he did with Toad Sage Mode and Kyuubi Mode during the war.
His current mode looks like Kyuubi Mode + RSM. He was only using a little power, which is why he didn't go full Rikudou Mode with the TSB and etc.
Naruto's RSM when fighting Madara and Kaguya had the toad pupil. The black around his eyes is just the outline of his eyes.
ah,you see this is where i have a different classification of things.....how can he be in a rikudo sage MODE,when he is in a base MODE at the same time....my answer to that is that it is a base mode that is greatly enhanced with his yang six paths chakra and not a rikudo sage mode...rikudo sage mode for me is his chakra cloak mode with TSB,BLA BLA...
just a different view of things i guess
EDIT:i just realized that by base you meant when he kicked the gudodama...i thought you meant base as normal eyes and all