Well, in this case, the doubled isolated pawns (after Bxc6 bxc6) on the rim are not weak. How are U planning to attack them? On the contrary, black will play Rb8 and control the b-file. 
mastering the modern benoni
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May 13, 2017
0
#2
i've in think something like this
we got a doubled pawn but win a open file i think tha's the reason too but its interisting because i didn't find any theory of this and my fear is don't know the best continuation i mean is 100% sure that white'll never takes? i just wanna be prepared
The bishop pair will become super dangerous to white soon as they try and make their normal pawn break on e5. I think the future dissolving center is the reason and the open nature the game will eventually take place will favor black in the position.
May 14, 2017
0
#5
e pawn will likely come under pressure and long term weakness on light squares could get ugly. Black can control the b and e file with rooks, even Rb4 comes into play. What is whites plan? He will just be tied to defending his position.
There is also the pseudo-sac 9...b5 to be considered, but the truth is that the whole line has been exhaustively analysed (see for example Dreev's recent repertoire book against the Benoni), and leaves little room for improvisation.
I think that 10.Bxa6 is too commital- Black should be fine playing something like ...Rb8, ...Re8 and possibly ...Rb4, creating a lot of pressure against the e4 pawn.
I really like the modern benoni and i enjoy studying its lines but there're a variable that they never explain and i suppose it's very infrequent but to master the benoni i need to know all its vagaries and my question is why white never takes this knight in this line? i mean thats pawns are weak