Reminds me of one of my first annotated games, which I saw when I was cleaning up the house (I was white).
1 e4 c5 2 Nf3 d6 3 d4 cxd4 4 Nxd4 Nf6 5 Nc3 a6 ? "This must be a very bad move, no development" 

Well the advantage for me is that the closed sicilian is very popular and I have played it myself a lot, which a lot of players here remember. So when they see 2 Nc3 they automatically assume a closed sicilian.

Btw players like Short and Timman often make use of these transpositional tricks. As an example check Timman-Polugayevsky Amsterdam 1981 in which Timman move-ordered Polu into a sub-optimal closed.
1 e4 c5 2 Nc3 Nc6 3 Nf3 e6 4 g3 Nf6 5 Bg2 d6 6 0-0 and now 6 .. g6 (best in the closed) isnt so good as white can transpose to an open sicilian where black has a weird mix of schevy and dragon which doesnt look too good. Polu played Be7 and got into a closed, got cramped and lost. Keep in mind with these tricks that it helps to know your closed stuff as well.

I still dont understand the fuss. If you are going to delay Nc6 so say 1 e4 c5 2 Nf3 d6 3 d4 cxd4 4 Nxd4 Nf6 5 Nc3 g6 then still after Bc4, Be3, f3 (not necessarily in that order) you get into yugoslav dragon territory. If you then keep insisting on not playing Nc6 as black I think you are basically obliged to flick in a6 at some point thus returning to my original post. I'll admit I misunderstood BK's question, but I think it doesnt make a practical difference.

@woofwoof, that was exactly my point about g6-a6 setups, they tend to work only with "lesser" lines for white eg 6 h3, which I think everyone will agree doesnt threaten the survival of the Najdorf. I have won quite some games by move-ordering people out of the Najdorf into the dragon, without them realising that a6 isnt really what is called for when you get H-bombed in the Yugo. Eg games against Najdorf afficionados often start 1 e4 c5 2 Nc3 Nc6 (supposedly best against the closed) 3 Nf3 d6 4 d4 cxd4 5 Nxd4 and now they discover they have to go into the dragon or the classical, which they are far less familiar with and especially in the dragon they tend to play a6 at some point. I think that a6-move is probably something genetic with Najdorf players

it seems with the early a6 one might be able to playin chinese dragon fashion with Rb8 and b5. This is the dragon i would play if i ever take it up.

BK,

You were right all along.  The first time ...a6 creeped into the move order was with Willempie's post and I thought I had missed something.  I'm sorry for my confusion on this.

Woofwoof, I will still disagree that the Najdorf-Dragon is a dangerous weapon.  There are of course many interesting variations.  After all, Black has only lost a tempo and White needs to prove that it's important.  But The burden is on Black to prove his move order is more than merely a confusion of two distinct systems.

I'm not sure that this really belongs in this thread or the Dragon thread, but since it's here, let's deal with it.  But remember, there's already a thread devoted to the "dragondorf" or whatever it's being called.

Oops! sorry.  For 6.a4, i'd rather respond 6....Nc6!? instead of 6...e6.

Willempie and all,

I should have noticed the inclusion of ...a6.  Clearly, White is very happy to see Black waste a move in the Dragon with ...a6 and has no real fears from a theoretical perspective.  There are of course practical hurdles to jump, but White simply must have an advantage when Black mixes systems like this.  I've only played against ...a6 in blitz and have an overwhelming score despite being primarily a "left-handed" player as White.  (That's a reference to Petrosian's playing d-pawn, c4, and Nf3 openings.)