Galborix would want to keep them safe and close to him thought.

@Imposter: I still find it extremely hard to believe that Galbatorix won't keep his HOHs near him, so if ROK were his hiding place it would have to be near his castle and like Saphirarox pointed out, it won't open for Eragon. Which goes back to my old theory that it may not have anything to do with Galby (directly I suppose)

@SR: Hahaha oops, silly me I wasn't really paying attention to what I was doing. Yes I did! I'm so confused about where the werecats are gonna come into play!

@saphirarox Do you think that it could be as far as the hadarac desert or on the island of Eaom?

@banannabel. He would keep them near him, so he could extract energy from them, when he needs it.

Exactly, so why would the werecat be instructing Eragon to go near Galby when he's going to go there to kill him anyway?

@SR : WHAT NEW ONE?? caterpillar WAIT

Edit:
1. Why is it that when i typed o-m-g it became caterpillar??
2. RORAN CAN'T DIE!! CP THAT ISN'T FAIR!! Or maybe Saphira got there in time to save him, like right after the smiling bit.
3. caterpillar caterpillar caterpillar caterpillar [just checking to see if those turn into caterpillars too]

Eragon's trying to kill Galbatorix, but Galbatorix would protect himself - with his dragon Heart of Hearts, so he would keep them near himself.

Wait wait, I don't think you get my logic

See, if Eragon was instructed to go to ROK then to the VOS it was so that he could get help [in the form of an HOH or something] to defeat Galbatorix. So it makes absolutely no sense to have to go all the way TO Galby to GET to the ROK/VOS when the only time Eragon will meet Galby is when Eragon will kill him. Does that make sense?

caterpillar

Yes it does, but what is the Rock of Kuthaian then?

I don't think that Galbatorix knows where/of the vault of souls. My guess is that the ROK is the rock mentioned in Eldest during Eragon's training. Here we go..............

The rock is called the rock of broken eggs or something, and here is the theory. This place is named because there was a large amount of dragons which once lived here before the dragons and elves trusted each other. The first Eragon, met his dragon and learned of HOH as sort of an afterlife of the dragons. So Eragon, with the help of dragons created the VOS. This is a secret place that only the first Eragon knew of where he preserved the dead dragon's souls and stored them to forever be at peace. The door would only open if the first Eragon's name was spoken..........

Eragon and Eragon a luck chance? Not! Eragon speakes his name to the VOS near the rock also the ROK and the vault opens filled with hundreds of dragons that the first Eragon had preserved. Eragon takes them and goes to kick Galbatorix's sorry behind.

I had that idea, but I thought the Vault of Souls might be owned by Galbatorix - and that is where he stores his dragon Heart of Hearts he stole.

That seems somewhat unlikely as he would probably keep them in somthing that Eragon couldn't access by saying his own name :S

I think Eragon has to say his true name, which is why the subject of his true name has been in every book, to open the Vault of souls - where all the dragon Heart of Hearts lie.

True, but perhaps they are somewhat similar to each other, both being the first good dragon rider of their time.

Maybe, but whatever it is, I think it is going to play a big part in Book Four.

Kind of obvious, just saying.

Um yeah. Well at the end of the day CP decides what it is...

True, but it is likely that it has something to do with the VOS

Yeah, the two thing probably interconnect, or something like that.

That's a pretty good idea. There were some guesses that The Rock of Kuthain was a mountain that stored Galby's Elunari.

Personally I think that the rock of kuthian is somewhere in the mountains in the middle of the hadrac dessert. I recall somewhere in the books that it is stated that this is where the wild dragons went to die. I will look for a quote later.

yeah, I remember that part. In the Hadarac or maybe one of the mountains in the Du Widenvarden forest.

Still not got book 4, but with all the talk about it - I could probably piece together in my head about what's happened in it!

I know that Eragon found dragon heart of hearts somewhere, I know that Roran nearly died but survived and even I've managed to read 4 chapters of Inheritance (as a sample on my kindle though), all I need now is how Galby is going to die