you can get the sun sigil straight after beating yunalesca. s'wat i did anyways.

I see zanmato as a reward for having enough gil. But i am half and half on the teams "for" and "against" zanmato. The move is a way to get the b**ch outta the way, but you dont get the squashy feeling like you've just beaten a really hard monster.

But also training so much means you totally stroll through the rest of the game and makes the final boss seem like a battle between a dingo and a Behemoth King.