I have Lemos book, and he goes for 6. e4 with d5, Ne2, andsoforth, like how Lenderman-Robson. I do not like this line, because I feel that the centre is very shaky for White, and the position feels a bit too holey for my liking.
If you see the YouTube introduction by Nick Pert, he definitely has something on the line, what it is I am not sure. But he has 9...Re8 on the board:
http://shop.chessbase.com/en/products/pert_solid_and_safe_against_indians_play_t...I have Grandmaster Brick 2: 1. d4 by Awrukh, and he goes for 9...Re8 10. Re1 a5 11. Qe2. I really get destroyed in this line as White, and based on the games that I see in the database, it looks like White has to be the one to be careful not to slip into a bad position nowadays. Black has quite a lot of counterplay, and it just keeps coming. Black even has a few lines to choose from.
If you have Delchew/Agrest book on the Grünfeld, you can see some of Black's counterplay. It was written in 2011, but it seems that White's chances look even worse now than before, at least in mine eyes.
If you have the Wigorito book Chess Developments on Grünfeld, he examines the Fianchetto with knight takes on d5 in depth. The last game of that chapter is Awrukh-Nawara 2012, where Awrukh actually deviates from 11. Qe2 and plays 11. Qc2, but still lost because Black got a kingside attack.