Sirius. Spy?

[heidi.h.tandy.c92 at alumni.upenn.edu]

No: HPFGUIDX 14966

--- In HPforGrownups at y..., Jen Faulkner <jfaulkne at e...> wrote:
> But I don't know that the military model of open warfare is really 
the
> best one to use for Voldemort's organization anyway.  There were no
> battles or armies involved, as far as I understand -- it seemes much
> more like the model of a secret, revolutionary society (the 
conspiracy
> model), with a 'catchy name' (Death Eaters), an anti-establishment
> mentality, insignia and loyalty oaths (the Dark Mark), secrecy of
> membership (no card-carrying for them), even plausible deniability 
for
> the members at the top (Lucius, e.g.).  <SNIP> 
> Given that secrecy, it seems more likely that Sirius could have been
> believably high-ranking, even second in command.  After all, we 
(and the
> wizarding world in general) know very little about the actual
> organization of the Death Eaters, and what made some of them more
> important than others.  Loyalty to V and his ideas?  Magical
> ability?  Cunning?  

A weird thought just crossed my mind. Would it be... Could it be 
possible that *sirius* was spying on Voldemort's organization from 
the inside? I know we're all assuming that task was Snape's, but do 
we know - can we be very very very sure - that Sirius wasn't spying 
on, say, the lower levels of the organization (the group that wasn't 
trusted enough to get the Dark Mark yet - i.e. the trainees), and 
Snape wasn't spying on the mid-level echelons? It might explain why 
people found it so easy to believe that Sirius was on Voldemort's 
side - if he'd been acting that way for a while, even undercover...
And it would've made sense, from the Potters' and Dumbledore's 
perspective - who would make a better secret keeper than someone who 
You Know Who thinks is in league with him, but really isn't?

This is completely far-fetched, I know...but....still.....