Sicilian Najdorf 6. Bg5 line In the Najdorf can white play 7. Qd2 and plan later 0-0-0 for faster development? It looks very interesting. But we do not find such games with these move orders. Chess experts, please explain with variations and explanations so that it can help many budding players.

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1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6  5. Nc3 a6 6. Bg5 e6 7. Qd2
This line is not very popular because black can challenge the bishop with 7…h6.
Now white is forced to exchange his bishop against the knight, either by taking right away 8.Bxf6 or after 8.Be3 Ng4. This is something you'd rather avoid, though its not immediately problematic for white. 

If you try to avoid this with 8.Bh4 you run into 8…Nxe4. I actually lost a game like this, if I remember correctly, some 10 years ago.

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 
7. Qd2 h6 8. Bh4 Nxe4