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Did they need an advanced wizard to watch over Harry over the summer? No.
How can we compare travelling across England to watching a teenager at a residence? I don't think that placing inept wizards (Mundungus Fletcher) to watch over Harry does anything to prove the lack of expertise in witches and wizards in the Advance Guard.
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I don't think that some of these wizards can apparate silently.
Well, as you see, I believe otherwise. I showed you above that the bulk of the Advance Guard are shown to apparate silently by using logic and the books... the rest we can assume can as well.. we have no evidence to suggest they are unskilled wizards and therefore must give them the benefit of the doubt.
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Also, you are forgetting that if Harry went along with them, he would have made a very loud crack.
Am I forgetting? I do not think so. Side-along apparation relies solely on the wizard responsible for the apparating bit. Harry would not have made a noise if he was with a wizard or witch who can apparate silently, as we saw when Harry apparated with Dumbledore. In fact, on the way back to Hogwarts after the Cave, Harry was the one who apparated both him and Dumbledore back to Hogsmeade. If a sixteen year old, with a sick old man at his side, can apparate silently, there is no reason to believe
every member of the Advance Guard couldn't as well.
All of that aside, it seems that JKR really did just make the idea of side-along apparation while writing HBP. Here is the proof:
QUOTE(OotP. The Advance Guard @ pg. 51 US Edition)
"Brooms," said Lupin. "Only way. You're too young to apparate, they'll be watching the Floo Network, and it's more than our life's worth to set up an unauthorized Portkey."