I think what
@Woodrow is speaking about is this SPECIFIC instance. Kyuubi gathered all the nature energy that was available when the double FRS was fired off. While Kyuubi CAN gather sage chakra, he took it all already. After Indra Arrow/FRS clashed, its been regular chakra between them. Sasuke had none left to fully activate chidori and Naruto used the last of his own chakra to make a regular rasengan, but not enough for his body to be able to attack him with it, which is why he fell down exhausted and they just punching the shyt out of eachother. No chakra left to use jutsus. Kurama then molded the last little bit of his own chakra to give to Naruto but Sasuke took it and had enough to activate chidori.
All the other instances of Naruto being in Sage+Bijuu mode has been Naruto gathering the sage chakra. This is the first time that we saw Kurama gather the sage chakra FOR Naruto (which is D.E.M. anyway).
@Notorious 1 E.Y.E. is correct, Kurama can do both, he just never did until now with the FRS.All yall are right actually, your'e just arguing different points at different times about the same event.