I know. I looked that up as well yesterday. weird huh?

I'm torn on it. But it ultimately doesn't change a thing: the two major chakra constructs are Susanoo and Kurama's avatar. Since no other Biju does this, a chakra avatar is apparently Kurama's hidden kekkei genkai. It's never called that (for some reason) but it essentially works like a KKG.

I have a feeling this ability is due to Kurama being composed of the majority of the Ten-Tails' Chakra.

what abt gaara's transformation? the sand-chakra avatar?

To me it sounds like a normal thing considering that Shukaku is made out of sand afterall. So this is just a Tailed Beast (Partial) Transformation right? But Kurama's ability gives itself and his jinchuriki an additional Chakra Mode, which the Ten-Tails' jinchuriki had a similar case (Madara) with that white chakra cloak thingo.

I thought chakra mode had more to do with the kind of seal used by the 4th hokage. It had something to do with chakra mixing or something if I remember correctly. it's the byproduct of the seal.

You mean by the Yin-Yang splitting whatever? Yeah not sure about that, I'm just basing this on the fact that both Ten-Tails' Jinchuriki and Tenseigan users have Chakra Mode, and both are Gen 2 (directly related to Kaguya). Which could mean that you'll get Chakra Mode if you achieved one of the following Gen 2 abilities:

1. Ten-Tails' Jinchuriki (Obito, Madara, and Naruto)
2. Rinnegan AND Six Paths Sage Mode (Hagoromo?)
3. Tenseigan (Hamura and Toneri)

Obito had those red chakra arms, which I consider that a partial Chakra Mode, Madara had that white chakra cloak, Naruto had that "Ten-Tails Chakra Mode", and Toneri had that Tenseigan Chakra Mode.

spsm doesn't get u any chakra modes, for all I know. but every bijuu has at least 2 chakra modes. the chakra cloak that looks like bubbles, and the vrs 2 mode. and Naruto had a tt chakra mode, which was unique and awesome. And rinne is a dojutsu, and the only dojutsu that gives u chakra mode, is made purely by hamura, which means that not even kaguya had it. and imo, shaping chakra like arms doesn't count as chakra mode, since its basically the same thing as making a rasengan.

Can we get back to the topic at hand? It seems to me that the question's been answered, unless someone has something to add? I can go 20 more rounds on this whole chakra thing, but let's do that in an appropriate thread.

kay.