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I suppose the idea of snatching Harry from right under Dumbledore's nose would have tickled Voldemort. I mean, Dumbledore is the only wizard he ever feared, and so to be able to outwit him like that would be quite an achievement.
Still, if he had just got Barty Crouch Jr. (in Moody form) to ask Harry for a word then stun him and run out of the castle under a disillusionment charm then it would have still been snatching him from under Dumbledore's nose, but it would have also been snatching him from inside the Hogwarts castle, where he appears to be untouchable. I imagine this would have amused Voldemort even more.QUOTE
Also, Voldemort mentions to Wormtail quite early on (I can't remember where, and I haven't got OotP in front of me) that it would be too risky to kidnap Harry during the World Cup as there were so many Ministry witches and wizards about. I think this plan was designed to achieve a number of goals.
Yes I did remember this when I posted this, but still, apparating then disapparating takes a second. It's not like Wormtail would have had to battle his way through a line of Ministry wizards to get to Harry - its just a quick appear and disappear. Even if they didn't want to use that plan they could have still, like I said, get Barty Crouch Jr. to stun Harry after a lesson.QUOTE
First and foremost was to abduct Harry. We are told that he cannot be harmed while living in the home of his mother's family, so Privet Drive was out of the question. I have mentioned above that it would be virtually impossible to take him while he was at the World Cup. Next, Voldemort has no knowledge of Harry's friends, so he could not have known that Harry spent the remainder of the Summer outside of his mother's protection, so in no way would it occur to Voldemort to travel to Ottery St Catchpole and take him from the Burrow. That leaves Hogwarts. When you look at it this way, the only place Voldemort could take him from was Hogwarts.
I think there was a small window of opportunity at the Quidditch World Cup if Wormtail had been using a disguise. After all, no-one knew Voldemort was returning to power so no-one would have really suspected an apparently harmless wizard/witch to want to snatch Harry. Wormtail could have disguised himself with a Bertha Jorkins polyjuice potion or a Disillusionment charm. It would have been easy enough. And even if, like I said, Voldemort didn't want to take that risk he could have got Moody to stun Harry after a lesson then either fly back to him using a broom or, if they wanted to do it less suspiciously, they could have used the fireplace in Moody's office to travel using Floo Powder to Voldemort. Seems so much easier.QUOTE
The second goal was to be reborn, albeit in a mortal body, rather than the "immortal" one Voldemort planned for after the deaths of James and Lily. For this he needed the blood of a foe. Wormtail rightly points out that any witch or wizard who was against him would do. However, the protection from Lily which runs in Harry's veins would also run in Voldemorts, if Harry's blood was used. Therefore Harry was an integral part of Voldemort's regeneration.
A fair point, but he still could have used Harry if they had used one of the theorys i just talked about.QUOTE
In essence, the plan was very simple: get Harry to touch the Triwizard Cup, which would then transport him to the site of Voldemort's rebirth. It was arranging everything around this point that was difficult.
Exactly. It was difficult. The portkey doesn't have to be the Tri-Wizard Cup - he could have made a text book a portkey then given it to Harry after the lesson. That would have been so much easier don't you agree?QUOTE
The third goal was to infiltrate Hogwarts, with Harry's abduction being a welcome consequence. To sneak a Death Eater into the one place people believed Voldemort could not enter, let alone a Death Eater who won the trust of all the staff, would be the ultimate insult to Dumbledore. It would mean to the magical community at large that nowhere was safe.
Using one of the theories I just talked about would have still fulfilled your three goals, but just made things so much simpler for Voldemort.QUOTE
Wormtail could not be the impostor. We must remember that he contributed (in howevr small a way) to the creation of the Marauders Map, and after the events in PoA he knew that Harry was in possession of it, and that he knew how to read it. Of course, the fact that he conveniently forgot to mention the existence of such a map to Barty Crouch, Jr. is a moot point. Wormtail could not pretend to be Moody for a full year as he possessed neither the courage nor the guile. Furthermore, the victim had to be Mad-Eye. He was starting his knew job at Hogwarts, and was only staying for a year, as much time as Voldemort needed. He was a close friend of Dumbledore, trusted and respected, and as such his deception would just add insult to injury once Dumbledore discovered the truth.
Did I say that Wormtail had to be the imposter or the victim didn't have to be mad-eye?
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Here, I think, we can assume that Voldmeort was under the impression that Dumbledore would uncover the plot sooner or later, but hopefully not until it had succeeded. Can we then argue that Voldemort was knowingly sending Barty Crouch, Jr. to his death, or at least, back to a life sentence in Azkaban? I think we can safely say he knew, and did it anyway.
In Voldemort's eyes, the Crouch family was a loose end. Crouch Sr. was responsible for sending many of his loyal followers to Azkaban, and Crouch Jr. we know was very young when he took part in the torture of the Longbottoms. It is safe to assume that he was not a member of Voldemort's "inner circle", whereas the Lestranges clearly were. As such, he was probably not valued as highly, and was therefore disposable. He became a willing pawn in Voldemort's scheme to be reborn, and could be sacrificed in order to carry out Voldemort's long term aims.
Okay, so you have made a fair point here, but just because Barty Crouch Jr. had to be disposed off didn't mean that they had to make such a long-winded plan? Sorry I don't really understand what point your trying to make here 
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Looking at it from this angle, was there any way things could have been done differently? Probably not. This plan achieved all three outcomes, with the only collateral damage being
a soulless Crouch and a still-living Harry. From Voldemort's point of view, that's almost perfect
Yes there was
Like I said Wormtail could have disguised himself as Bertha Jorkins then snatched Harry at the Quidditch World Cup, or Barty Crouch Jr. could have given him a portkey after class. Portkeys can be anything Harry wouldn't have known what he was taking. Or Crouch could have stunned Harry after class and Floo Powder'd him to Voldemort. Seems simpler and gets his three aims does it not? You say it's 'almost perfect' but it's not, it's almost completely ruined. He manages to regenrate but Harry manages to tell Dumbledore about the Dark Lord's return, which is the last thing he wanted. Be interested to hear your thoughts, and I hope i have made sense and not waffled on too much