As we all know during the Last, Naruto didn't utalize full on RSM, however he absolutely displayed feats. Tonrei possessed the tenseigan enabling him to fly & utalize gudodama. Naruto & Tonrei had an epic dbz style aerial battle, tonrei utalize gudodama numerous times to try and kill Naruto. We all know gudodama cannot be physically touched unless you posses Rikudou chakra. The fact that Naruto was effortlessly fighting tonrei who was basically in tenseigan mode (RSM rip off mode), Naruto defeated him in Kyuubi Sage Mode(KSM) whilst displaying RSM powers(Flight + Blocking Gudodama). So its mangafact that Naruto still has RSM.
Naruto FTW!
Naruto FTW!