Who knew Snape was a DE Re: What if other teachers behaved like Snape?

[snow15145]

No: HPFGUIDX 101304

Pippin:
> It is a secret. Sirius does not know, in GoF, that Snape was a DE.
> In fact, he can't believe that Dumbledore would knowingly hire
> him if that were the case. (chapter 27, GoF)

Mel:
Which is really something when you realize he's been incarcerated AS
a DE, *with* DEs for TWELVE YEARS. Now that's just odd.
He's heard NOTHING about Snape?
Not even how that weasel slipped out of facing his charges...or how
that snake pulled the wool over everyone's eyes...? Nothing? Either
it's a BIG DARK SECRET all wrapped up in some magical-wizarding bow
or Sirius Black is really, really dumb. >snip<

Snow replies:
Very good point, except that JKR protected herself by presenting the 
pencieve scenario with Karkaroff where he states that not all the 
death eaters new each other. So even the most loyal of servants may 
have not known every one of Voldemort's servants. What if no one 
other than Voldemort new of Snape being one of his servants at that 
point, yes even Lucius or Bella? 

What if Snape after being disrespected by DD over the whole 
humiliating, and to Snape life threatening, prank incident where DD 
neglects to punish any one of the offenders to the degree that Snape 
felt they should have been punished, turned to Voldemort almost in a 
fit of rage over the injustice. Snape then tells Voldemort that he 
could be of use to him but doesn't want anyone else to be aware of 
his allegiance because he could be of more use to him as a spy. 

As far as Lucius and Snape's friendship, do we know for sure that 
Lucius knows Snape to be a DE? We know they speak to each other but 
do we know that they are anything more than so-called Slytherin 
friends? We have been led to believe this by association but are they 
death eater friends?