knight504 Spoiler There is nothing in the manga to support these statements. Spoiler The whole exercise is about chakra control and maintaining that control. Sasuke explicitly mentions that 'too little or too great' chakra results in breaking of the contact with the surface of the tree. I mean, why did Kakashi even mention Sakura's reserves in relation to them failing to climb the tree? He said it just for the laughs? He's outright saying that right after their failure to climb that, 'they have large reserves, which is why they failed to control their chakra properly (Sasuke's statement makes it that much more clear); Sakura's smaller ones made it far easy for her to control the flow of the chakra beneath her foot, hence, the tree never repelled her back.' This doesn't even need an analysis. It is explicit enough as it is. Hmm, I'll say you are more or less correct. As good control results in better Jutsu usage. I agree with this point. I probably worded it poorly. You are right. I was probably half asleep when I typed that. I probably wanted to add that Handseals argument and advanced techs one as well, that I forgot the crux of it all. My bad. They don't have to, it's kind of obvious. Also, the DBs cover it handily, along with Obito's statements: Spoiler The white symbol is Yang and Black is Yin. Inton, as I stated, creates a form out of nothing (Susanoo) and it governs imagination; Yoton breathes life into a form (Mokuton). Genjutsus are also Yin in nature. Basically, Yin is mental and Yang is physical. Yin is to form something out of nothing and Yang is to control something that is already there by breathing life into it.