Two observations. 

The two early a4 lines (7 a4 and 7 Qd2 Bb7 8 a4)  are both critical in the so-called Accelerated version of the Reshevsky variation, aka Dragadorf, which at the moment seems the most viable and interesting way for Black to implement the concept of combining Dragon and Najdorf ideas.

On his DVD Williams looks at 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 a6 7.f3 b5 8.a4 b4 9.Na2 (!) e5 10.Nb3 d5 11.Bg5!  and suggests 11...Nbd7 12.exd5 h6 13.Bh4 Bb7 as satisfactory for Black, but analysis by the young Singaporean IM Daniel Fernandez (currently resident in UK) suggests that after 14.d6! Black is suffering, e.g. Qb6 (Williams)  15.Bf2! Qxd6 16.Qxd6 Bxd6 17.0-0-0 with a comfortable edge for White, e.g. 17...Ke7 18.Na5 Bd5 19.Nc4.

Williams also looks at the second critical early a4 line, in the context of the game Haznedaroglu,K (2499) - Gunnarsson,J (2462) [B72] 17th TCh-Eur Novi Sad SRB (3), 2009 which went 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 a6 7.f3 b5 8.Qd2 Bb7 9.a4 e5 10.Nb3 b4 11.Nd5 (11 Na2 appears to be less of a problem here) 11... Nxd5 12.exd5 Nd7 13.0-0-0! Rb8 14.f4! and here the only moves I have seen examined are 14...Bh6 and 14...Be7, as in the game. Williams offers a later improvement for Black in the Be7 line, but I suggest that it is more in the spirit of the opening to offer two pawns with 14...Bg7!? 15.Qxb4 0-0 16.Qxd6 Re8, when I think Black has good compensation in a very sharp position.

cool, thanks I will look into that line. I don't have any examples of his games. One of my friends just told me that he palyed the line.

I don't think I can help, but maybe some examples of his play might help?