If Naruto were to use Rasenshuriken ANYWHERE around Strange Tree Mountain, it would have woken up Fukasaku.. that's what I believe. I hope Naruto was just practicing his form in 1-3 tails Kyuubi mode. Remember he can use the Kyuubi's chakra to extend his limbs so that's where the slicing could have came from.
So what your saying is that Naruto's 3-tail extendo-arm thing wouldn't have woken up Fukusaku?
I think he's just a heavy sleeper, plus, his bedroom is like 60 feet above where Naruto is training, I doubt he would have heard it regardless of how light or heavy he sleeps.
Yes, Naruto's RS DID make a crater when he first used it, but remember, RS is wind, therefore, it has the ability to cut, if used properly.
I don't get why people say that ''That jutsu'' is something other than RS.
I mean, Naruto only has one jutsu that he's not allowed to use, that's why Jiraiya said ''That jutsu'' instead of RS, there was no reason to get specific about it, Naruto knew what he was talking about.
And like I said, if Naruto did have some kind of super powerful jutsu up his sleeve, he would have used a loooooooong time ago.