Petunia's Protection WAS: Two Questions

[karen_lvssr]

No: HPFGUIDX 112705

<snip>
Bookworm:
> Just a stray thought here – could this be his shortest stay on 
> Privet Drive because something happens to Petunia `this'
> summer and Harry loses that protection?

Karen L. here,
My stray thought is this.  Being that JKR has stated that the next 
summer  should be Harry's shortest stay, could it be that Harry 
doesn't need to stay there as long because he had received an 
extra layer of protection during his time in either the 
graveyard (GoF) or in the MoM (OoP)?  LV initially overlooked the 
blood protection from Harry's mother, underestimating the old 
magic at his own cost.  LV could have done it again!  His narrow 
minded goal of killing Harry could have once again clouded his 
"reasoning".  Remember in GoF when Harry thought he saw a 
"gleam of something like triumph in DD's eyes" after he told DD 
about Womtail taking his blood to use in the potion to bring back 
LV? That "gleam of something like triumph" is interesting to me.  
It must mean something!  
Any thoughts?