What could happen in HP 7?

[Siva R.V.]

No: HPFGUIDX 133794

After reading book 6, I have made the following theories about book 
7.  Anyone to agree or refute? :)

Theory1: Slughorn is the DA teacher who taught both Voldemart and 
Snape.  He might teach Harry too in year 7 in DA.

Theory2: Harry looks mediocore against Snape in fighting in book 6.  
Could be that Harry gains more powers after becoming 17 ("coming of 
age").

Theory3: Lily is the one who saved Snape while James was teasing him 
(mentioned in book 5?). I won't be surprised that the author throws 
up an angle wherein Snape loved Lily but James finally got her.  
Since Harry was like James could be the reason why Snape hated 
Harry. But being the son of a woman whom he loved could be that 
Snape is helping Harry.  Snape might have hoped that by revealing 
the location of Harry's parents that Voldemort will kill James and 
Harry leaving Lily alone.  Note that Voldemort gives Lily an option 
of running away leaving Harry to him.  It might be a secret 
agreement between Snape and Voldemort that Voldemort will leave 
alone Lily and kill the other two.  The killing of Lily might have 
made Snape to act against Voldemort.  Snape might have honestly 
confessed this to Dumbledore which made him believe Snape.  I guess 
probably this might be the remarkable info about Lily which will get 
revealed in book 7.

Theory4: Buckbeak/Phoenix will have a role to play in killing of 
Nagini, pet/horcrux of Voldemart

Theory5: RAB = Sounds like Reamus Albus ????.  Someone related to 
Dumbledore?  Whats the history of Dumbledore?  Is he related to 
anyone?

Theory6: In book 2, Dumbledore tells Harry that one day Harry will 
be glad that he pardoned Wormtail.  Could be that Wormtail returns 
Harry's favour in book 7.

Theory7: What is the role of Hagrid's brother Grawp? My theory is 
that author is making sure that everyone has an important role?  
How Hagrid will help Harry in book 7?

-siva