OOP: Luna , Snape

[kappitoo]

No: HPFGUIDX 63603

I was just wondering what theories people have on Luna Lovegood. She 
turned up at the beginning of the book and without any development at 
all seemed, somewhat uneccesarily, to be in every important scene. 
Obviously this is a setup for future novels, but does anyone have, or 
has anyone heard, any speculation on her role in the future?

Also, on a different topic, we have been told again and again, 
despite Harry's own feelings, that Snape is to be trusted. And 
throughout the OOTP we more and more see the truth of that statement. 
But we still are kept unaware of why DD trusts Snape, and his role in 
the OOTP. Perhaps, since he was told to teach Harry Occlumency, he is 
still meeting with LV and the DEs, despite the fact that  LV is 
supposedly so skilled at Legillency (whatever its called) that he can 
see if one is lieing or not. Or something like that. But has anyone 
seen any other clues as to Snape's role in the OOTP, or what he has 
done to gain DD complete trust?

Kaps