Two Plot Problems

[justcarol67]

No: HPFGUIDX 187651

Carol earlier:
> > In GoF, Sirius Black makes it clear that he doesn't know Snape was ever a DE, and if he didn't know, Lupin wouldn't have known, either. <SNIP of almost whole post>
> 
> Alla:
> 
> I do not understand it. Are you saying that Lupin and Sirius must know the same things and not know the same things?
> 
> Putting aside the fact that Sirius spent twelve years in hellish prison and Lupin spent twelve years we do not know where, but definitely not in prison, which to me already implies that Sirius would not have known a lot of things in the outside world and Remus would have known them, how does that work out exactly even if Sirius was not in prison?
>
Carol responds:

Sirius Black was thrown into prison almost immediately after Godric's Hollow, by which time Snape was teaching at Hogwarts and long since spying for Dumbledore. At that point the DEs disbanded. If Black didn't know at that time that Snape was a DE, the other Order members, including Lupin, wouldn't know, either (and DD would have kept Snape's DE background as secret as possible to protect the identity of his spy). The Order was disbanded at that point, and Snape's hearing was apparently kept secret. I don't see how Lupin or McGonagall or anyone else not present at Karkaroff's hearing (aside from some DEs and Voldemort) could have known that Snape was a DE. And he certainly wasn't famous for casting Sectumsempra, or Rita Skeeter would have mentioned it when she listed Dumbledore's questionable hiring choices.

Also, if Lupin had known that Snape had been a DE, I can't see him trusting Snape sufficiently to drink a monthly wolfbane potion brewed by him no matter how good Snape was at Potions or how much Dumbledore trusted him. And surely he would have mentioned it in the Shrieking Shack in PoA if he'd known.

Carol, just drawing conclusions from the admittedly limited evidence available to us