Originally posted by Darkstorm Zero
A released Byakugou & the Sage mode are similar in visual apperance. that is true. However, there are also differences. Byakugou requires the semi-permanent marking on the forhead.http://mangafox.me/manga/naruto/v63/c621/6.html
http://mangafox.me/manga/naruto/v63/c621/8.html
http://mangafox.me/manga/naruto/v63/c621/9.html
http://mangafox.me/manga/naruto/v63/c621/10.html
http://mangafox.me/manga/naruto/v63/c621/11.html
http://mangafox.me/manga/naruto/v63/c621/12.html
http://mangafox.me/manga/naruto/v63/c621/13.htmlAs you can see, Hashirama never had any markings prior to activating "Sage Mode".
Evidence point #2: Byakugou does not allow for the use of Sage Arts and never did. Tsunade never once used a single sage art during any of her Byakugou activations. However, Senpô: Mokuton: Shin Sûsenju is definitely a Sage Art.
Hypothesis: it could be that Hashirama's wood release was the key factor in him learning how to absorb nature energy. In essence, trees are the most still(unmoving) living organisms on the planet, and they tap more directly into natural energies from the planet (they absorb nutients from the Earth and solar energy from the Sun via photosynthesis), it is possible that Mokuton allowed Hashirama to tap into it directly, however, this is just a theory, so take it with a grain of salt.
Heck, since they are so fixated on appearance, the way their respective markings appear is different as well.
Tsunade's markings only extend/grow outward from the location of her Yin Seal. Hashirama's markings slowly fade into existence, much like Naruto's Sage Mode marks.
EDIT: This post of mine to socool was at the bottom of the page >__>
Originally posted by Demonic Phoenix
It isn't logical at all. Tsunade's technique involves gathering chakra over a long period of time, storing it up in the seal on her forehead, and then at some later point in time, releasing it for her use, in the process, destroying the seal. Hashirama has no such seal on his forehead. Given that it is Kishi, yes, the techniques likely do have some link and it is entirely possible that Byakugou is a watered down version of Hashirama's Sage Mode, but based on the evidence in the manga, Hashirama used Sage Mode, not Byakugou.What? Naruto does not change by a marked degree when he uses Sage Mode. It is just his eyes that change, and the markings that appear around his eyes. Which is what happened to Hashirama.
There, 2 identical appearance-based factors between their Sage Modes. More than what exists between Tsunade's Byakugou and Hashirama's Sage Mode.