Question about the Priori Incantatem sequence in GoF

[slgazit]

No: HPFGUIDX 82457

I am a fairly new reader here, so forgive me if this question was 
raised before.

In the fight between Harry and Voldemort, Harry manages to get 
Voldemort's wand to emit prior spells. We know there was a flint wrt 
the order of appearance of his parents, so I will not mention that. 
Still, there are two other curiosities there that I have never seen 
discussed (perhaps they were in the past?):

1. Why is Cedric coming out of the wand when it was Wormtail (on 
Voldemort's order "Kill the spare") who has actually done the 
killing? He must have used Voldemort's wand, but why? Does he not 
have his own? Note we never see him holding a wand after Voldemort is 
restored, but there is no mention of his stowing the wand inside the 
robes which Voldemort later wears and from a pocket of which 
Voldemort removes it.

2. Priori Incantatem is supposed to play back all the spells 
performed by the wand. We see Wormtail's hand, a number of dead 
people and we hear the screams (result of the misc. Crucio's I 
assume). The one spell we don't see, which should have been there - 
right before the first of Harry's parents appeared - should have been 
the AK curse that marked Harry's forehead. But there is no mention of 
it. Has JKR ever explained that, or does someone else cares to try 
and guess? :-)

Salit