A question arised in my mind regarding why Naruto didn't incorporate the Lava Release into his Rasenshuriken earlier, when he got the chakra of the tailed beasts. Personally, I think I found an answer to this. I suppose it was because the tailed beasts still didn't completely trust Naruto so much, to lend him his chakra. Now, that the Sage manifested in Naruto's subconscious and declared him as the savior, I believe that's why the tailed beasts manifested in his subconscious and now, they have complete faith over Naruto, hence Son Goku lent him his chakra. Thoughts?