[HPforGrownups] Invisibility cloak & MoM Security WAS:Snape informed Order?

[P J]

No: HPFGUIDX 140205


Betsy Hp:
>I doubt it was obvious to the Death Eaters (and therefore Voldemort)
>that the Order was guarding the Prophecy.  They were using Moody's
>invisibility cloak, after all.  I imagine there was no knowledge of
>Order guards until Snake!Voldemort used his super snaky powers to
>spot the sleeping Arthur.

PJ answers:
You could be right about this but I'm not convinced.  There are just too 
many questions regarding this IMO.  For instance, Harry is said to be a 
rather small wizard and James's cloak is already too short to cover Harry 
fully - Malfoy spots him entering the train compartment in HBP by the flash 
of white sneaker.  If these cloaks can't properly hide a child, would full 
grown adult wizards fare any better?

Also, if we Muggles have motion sensors I should think that there would be 
something more than guards at the MoM which wouldn't be fooled by a Cloak 
(Sneakoscopes anyone? :)).   We already know that LV has spies in the MoM 
which could warn him of the sudden interest in that section of the building. 
  Else why would LV send Nagini to the MoM if he had no suspicions that his 
plan had gotten out?  If LV is trying to hide his return, it would be so 
much easier for him to send a person to check that corridor since they at 
least have a prayer of coming up with an excuse for being there... but a 
huge snake is a whole lot harder to explain away and points directly to LV.

It doesn't add up for me.

PJ