Does the Foe Glass Prove Snape = DD's Man?

[gelite67]

No: HPFGUIDX 155682

I just had a thought about Snape and the Foe Glass in GOF...

I'm assuming the Foe Glass showed Barty Crouch's (the son's) foes and 
not the Real Mad Eye Moody because I can't imagine RealMoody's foes 
would ever include Dumbledore.

Based on that assumption, does the fact that the Foe Glass showed Snape 
as a Foe of one of Voldemort's faithful and true Death Eaters at least 
provide support for the proposition that Snape is DD's man?

If Snape was a true follower of Voldemort, why would the Foe Glass show 
him as a foe of a Death Eater?

(In a way, it seems the Foe Glass is the obverse of the Mirror of 
Erised -- it shows what we desperately do NOT desire -- our foes 
closing in on us.)

Angie