User blog comment:Berserkchart486/Warring States Fanon Canon/@comment-6673974-20141225023253/@comment-4080775-20141227005545

This here proves that Handsigns and the Moon aren't connected:

"Hagoromo exemplified his teachings by distributing chakra meant to "connect" people's spiritual energies with one another. It would allow people to understand each other without communication and pray for one another's safety. However, people didn't use the chakra to connect with others, but to instead connect their inner spiritual and physical energies together. They kneaded their inner chakra to amplify it and transform it into modern-day ninjutsu. In the end, they ended up using their chakra in battle, just as Hagoromo's mother Kaguya did."

Kaguya used Ninjutsu, "Weaponized Ninshu", to fight her sons, so states the Mother site. There's no way this can be refuted as Kaguya couldn't have fought her sons with Ninjutsu if she was sealed up in the moon.

Technically, Handsigns aren't really required to cast ninjutsu, as show during the war by Madara, Naruto and Sasuke on several occasions. Rasengan is ninjutsu, and only requires chakra control, so that in itselfs shows that ninjutsu doesn't need handsigns to be ninjutsu. I see how a new handsign system was being suggested or slightly hinted at. Well, why fix something that isn't broken? Ninjutsu existed before the moon, and will exist after it. If anything it will be make this new RP suggestion just like bleach, but without fancy clans and handsigns.

I'm not posting it to argue, but I am posting it to provide proof and facts from the manga.

Want to read it yourself? Here you go buddy: http://naruto.wikia.com/wiki/Ninsh%C5%AB