Oh for crying out loud.

It's her actions that led to the entire situation of Sazh. 

It's her guilt that leads to the boiling point in chapter 8. "Shoot me" "You think I'd shoot you and everything would be sugar and rainbows" ring a bell?

It's these actions that lead to the sudden act of consciouness of Sazh that it wasn't Vanille's fault that Dajh became a L'Cie, but the Fal'Cie Kujata and that both of them were just pawns in the hands of the Fal'Cie

This realization led him to believe in the fight against the Fal'Cie and rejoin Lightning once more, which in turn lifted most of the guilt from Vanille's shoulders as well. 

How come this is any stretch? This is what happened in the game.

Vanille is awesome.

Only character that sucks is Hope (although he's still good as a party member)

Vanille did not cause Sazh to see the fact that the fal'Cie were evil.

Vanille was being passive. Sazh figured out that she l'Cied his son. Vanille didn't tell him. Then Sazh decided that it wasn't Vanille's fault and then he became an active fighter against the l'Cie.

Vanille didn't influence the plot, she was just there.

But, maybe you think that since she was there she was vital. 

She was being passive? 

So she saying for him to shoot her, as a means to alleviate the revenge he felt for the situation was being passive? She was just there. 

The person that was indirectly responsible for his son situation, was just there. 

In that spectrum, then you'd also have to consider Sazh non-essential to that particular piece of plot, since he was also just there by a coincidence. I mean, it wasn't Dajh who sensed both of them in Nautilus, and it wasn't Jihl who used that as a means to bring a cleavage point in both of them. 

No, it all happened by pure coincidence. Also, it was coincidence that it was Vanille's willingness to sacrifice herself to seethe Sazh's rage that also led him to see part of the truth behind his son's demise. Yup pure coincidence. She was just being passive, looking at Frocobo and doing all those annoying things that you so much loathe and despise. 

Let's hope the original poster doesn't read this argument, or anyone who hasn't finished the game.

I'm sorry for the massive spoilers, but both me and Dtewi had pointed out that we would be giving them. 

Quite frankly, after this time, FFXIII spoilers are pretty much everywhere. And people always get angry about spoilers, be it whatever game it is. I was flamed once for giving spoiler about Super Mario RPG, even though the game is out for more than 10 years.

YOu're blowing what I'm saying HUGELY out of proportion.

HUGELY.

It wasn't all coincidence. (Although "She was just a there" is a bad choice of words)

BUT she didn't MAKE Sazh see the fal'Cie were evil, Sazh saw it for himself.

Nah, don't worry.

But make sure you don't post anything spoilerific about Chrono Trigger in these two weeks, though.