"In order to prepare for kirin he needed to weave signs.
Rasengan doesn't require signs, rasengan shurriken requires clones help so he has to weave the shadow bunshin jutsu sign. But naruto really only has like kage bunshin, rasengan, and TBB +variants of each jutsu I mentioned."
In his preparation for Kirin, he used a fire style jutsu which required the tiger hand sign. Like I stated earlier, in order to prepare for kirin he needed hand signs.
You must be registered for see links
You must be registered for see links
According to the manga yes they can.
Fact is though, he's only shown doing one seal. I'm not going to say he did something when it's not even shown. That's not even logical even based on past evidence. Let's just assume he did it(sarcasm).