Snape&Karkaroff... and a third party?

[nkittyhawk97]

No: HPFGUIDX 92721

In the quote on page 651 of the US GoF containing, "One, too 
cowardly to return" and "One who I believe has left me forever" has 
never, in my eyes, had any room LEFT for speculation.

Karakaroff and Snape are the Death Eaters... place them where you 
will... they weren't present that night, they weren't dead, and it 
is pretty obvious Crouch Jr. is the one "most faithful" because he 
was missing as well, and wouldn't fit under any of the other 
descriptions. (dead, cowardly, etc.)

So, my question is, if someone else was the "One who I believe has 
left me forever", then where does that place Snape? Some could say 
he was secretly faithful, unkown to the readers, but then he would 
still have been listed under the six that were absent.
And Rowling only said in her interview, concerning the quote, 
to "work it out", therefore concluding we had all the information to 
do so, and that it didn't seem too difficult in her eyes.

Of course, she wouldn't say "Snape" right in front, because she 
still wants some suspense for those who may beleive he's essentially 
evil... aka those who question the quote's blantant simpleness.