JKR question about Cloak (Was: Concealment - a MAJOR Motif)

[Hagrid]

No: HPFGUIDX 168234

"julie" wrote:
> > Aussie now:
> > 
> > I have looked for theories about the never asked question to 
> JKR ... 
> > Why did DD have the Invisibility Cloak if he could be invisible 
> > without it? ...
> > 
> > Neville, however, was a very important person to hide.
> > 
> > DD was not sure if the Potter's or Longbottom's son was the 
target, 
> > so both would have been hidden. 
> 
> Julie:

> ... If or when Voldemort found their (Potter's) hiding place
> they could hide under the cloak (or if it's not large enough
> for all three, at least Lily and Harry). Unless Voldemort
> has the power to see through the cloak (which I don't recall
> reading), then he'd assume the Potters had moved on to a
> new hiding place. ...
> 
> ... while the IC could have been used to protect Neville, 
> why wouldn't the Longbottoms also be in a safe house 
> with a Secret Keeper--Dumbledore perhaps--protecting its 
> location?)
> 
Aussie: 
Voldemort himself is the greatest Occlemist in the WW. Unless those 
under the IC were stunned, Voldy could find them even without Mad 
Eye Moody's eyeball.

The Longbottoms were Aurers. At that time of Death Eaters attacking 
everywhere, they couldn't disappear without the contents of the 
professy becoming known. 

... And are we any closer to know WHY DD HAD THE CLOAK?