OOP SPOILER - Dumbledore <tells all> to Harry?

[Mimbulus Mimbletonia]

No: HPFGUIDX 66389

Why do I get the feeling that Dumbledore is hiding stuff still from 
Harry?

At the start of the book (more or less), when they are in the kitchen 
at the Order's HQ, Lupin says that Dumbledore wants Harry to know the 
basics, and it would be best for him to hear stuff from them than 
from other people and get a different version of things.
Could it be that they want Harry to know a specific version because 
they know all about Voldemort tapping into Harry's thoughts? And 
then, they chose what information they can (or want to) leak to 
Voldemort and his DE's.

Also, they keep talking about a 'weapon', and that prediction doesn't 
seem like much of a weapon to me. Could it be that the members of the 
Order want Harry to think of a weapon because they want to throw 
Voldemort off course?

Also, sure, the prediction is in the Department of Mysteries in the 
Ministry of Magic, and throughout the year Harry has been dreaming 
that he goes through the corridors there, but it was a trap, wasn't 
it? Who cares about the prediction? What if there were more 
predictions there that concerned Voldemort and Harry and they picked 
that one? And just because Dumbledore shows Trelawney in his Pensieve 
to Harry, doesn't mean that he couldn't have faked the prediction 
(that sort of reminds me of when Harry asked him what he saw in the 
Mirror of Erised and Dumbledore replied that he sees himself getting 
socks for Christmas).

The Order has people spying on Voldemort (Snape, and others, 
perhaps?), so it is very likely that there are people spying on the 
Order for Voldemort (and both sides are spying on the ministry, and 
probably the ministry is spying on them).
So all sides are sort of giving wrong directions and fake hints and 
whatnot so that the others won't really notice what's going on.

What were the DE's really doing in the Ministry? They weren't there 
to kill Harry, and they didn't intend to kill Sirius either. He died 
because of a well aimed curse that threw him beyond that veiled arch. 
(also, if Harry hadn't gone to the Ministry, Sirius wouldn't have 
gone there either).

I am starting to think that the Weapon really was in the Dept. of 
Mysteries, but it wasn't a prediction. Could it have been the 
archway? Imagine just Imperio-ing everybody you want to kill to go 
through it. What about time? If it could be harnessed or understood 
or something, then the one who would achieve that would have control 
over time. Also, one who manages to learn all there is to learn about 
the mind would have practically unlimited power.

I think that the whole dreaming-about-corridors-and-doors was 
Voldemort just seeing how much he can fool Harry.

In the chapter called The Lost Prophecy, Dumbledore explains about 
why he didn't Tell All in each of the previous 4 years, and then he 
goes on to explain about the prophecy and its meaning, and then he 
says that Harry posseses (spelling?) something that Voldemort will 
never understand - "In the end, it mattered not that you could not 
close your mind. It was your heart that saved you." And that is 
precisely the same thing that he told Harry at the end of the first 
year. He said to Harry nothing that Harry couldn't have figured out 
on his own, or that he hadn't said to Harry before.
His speech is long (not to mention long-winded), but Dumbledore still 
doesn't tell Harry what the weapon actually is.

Mimbulus Mimbletonia.