The chakra Sasuke and group felt

[NarutoIndra]

Kuarama's because Orochimaru knew what it was, having faced him before. He doesn't know the Juubi's chakra and the Juubi's chakra is senjutsu, meaning it can't be felt, and if it could; he wouldn't have known it was the Juubi as he has never encounter it before.

 

[Miyata]

Kuarama's because Orochimaru knew what it was, having faced him before. He doesn't know the Juubi's chakra and the Juubi's chakra is senjutsu, meaning it can't be felt, and if it could; he wouldn't have known it was the Juubi as he has never encounter it before.

How about because i posted straight from the manga ^^^

 

[UncleSi]

It is def Naruto's, maybe the other guys in the group don't know who's it is but Sasuke and Oro do...