I open my games as White with 1.Nf3 (usually, though occasionally something else), and against attempts at a Nimzo-Indian, I play 1...Nf6 2.c4 e6 3.Nc3.  I've been looking at 4.g4 against 3...Bb4, but also question its soundness, and wonder if 4.Qc2 really is the only way to go (assuming you don't wish to transpose to a Nimzo-Indian and play 4.d4).   

I noticed in the e-book that 4...Bxc3 in the 4.g4 line of the Anti-Nimzo Indian is a mere side note and appears to be assessed as solid, but unclear (maybe equal).  I am curious if I perhaps found an improvement for Black in the 4...Bxc3 line that makes Black better?

In Tony's e-book, he gives 1.c4 Nf6 2.Nc3 e6 3.Nf3 Bb4 4.g4 Bxc3 5.dxc3 d6 6.g5 Nfd7 7.Be3 Qe7 8.Be2 e5 and claims that "Black is solid".

While speaking only as a 2000-rated player, I still seem a little suspicious about the usefullness (and even the whole point behind) of 7...Qe7.  I therefore looked into it, and thought perhaps the following line was better than 7...Qe7 (copying moves 1 through White's 7th in the line mentioned in the previous paragraph):

7...0-0 8.Bg2 Nc6 (The development seems more critical than advancing the e-pawn a second time...also, plan to move the d7-knight to e5 to unblock the bishop) 9.Qd2 Nde5 10.Nxe5 Nxe5 11.b3 a5 

and I seem to think that Black would be slightly better here.  White's pawns on the queenside are clumped together and if White plays 12.a4 to avoid ...a4 by Black, his Queenside pawns become severely compromised.  The position still has all 16 pawns on the board with no signs of any pawn trades any time soon, and so I would think the closed nature of the position would make the knight another trump card for Black to go along with the better pawns.  Also, with 2 sets of minor pieces traded, Black seems to have less problems with either the slight disadvantage in space (the player with the space advantage wants to keep pieces on) or the direct attack on his king (now that half the minor pieces, and especially the White knights in a closed position, are gone).

Am I missing something?  Does White have an improvement somewhere between moves 8 and 11?  Or do we see 4.Qc2 becoming the move that 4.g4 players start running back to? ???