The chakra improved kakashi's ability to use Kamui, (Strength and duration)
Each stage of Susano'o is a new technique. If it wre a matter of chakra than Edo itachi, who had limitless chakra, would have PS
@Bold:lol no its all still susanoo. each stage is a different variation but not a new jutsu all together.
If you look at what your saying then you are agreeing with me. Susanoo is mearly a manifestation of ones charka in physical form. if one manipulates the charkra differently then the susanoo's shape, and power is also manipulated. This does not make it a new jutsu every time the form is changed. to put it simply, its one jutsu with many forms and abilities
@underlined: Edos do not have unlimited chakra. they have the same amount of chakra they died with. it seems unlimited because the chakra used replenishes. if it takes 150 points of chakra to use PS and Edo itachi only had 90 he cant use PS. His chakra levels will stay at 90 do to edo form but wont have enough to use PS