Significance of missing line (was: HBP paperback)

[dungrollin]

No: HPFGUIDX 156050

SSSusan:
> What do you think?  Did he go or no? 

Dung:
Nope. For exactly the same reasons as you.

SSSusan:
> But, yep, I'm betting Aberforth will be active in Book 7 somehow --
> whether that's bearing news from brother Albus or having knowledge 
> of Regulus' history or -- heck yeah! -- harboring Regulus, we shall 
> see.
 
Dung:
Except... no it can't be Regulus. If Regulus were being hidden by the 
Order, or by DD, DD wouldn't have gone chasing off after a fake 
Horcrux. You don't stab the Dark Lord in the back, fake your own death 
with the help of his mortal enemies, go into hiding, and *not* tell 
Albus Dumbledore about the Horcrux. Do you?

It can't be Regulus.