Mo Farah is a very big versatily runner...with the good preparation at the top level in the world from 1500 until also the half marathon...his pb are:3'28''8;12'53'';26'46'';1h'23''...
the half marathon time is not at the same same level of others pb,but he ran only two half marathon at this moment...
there is also the chanch that he will run the first marathon in London Marathon 2014.
I think that the marathon is less adapt for hime than less long distances...maybe for his running way.
I think that he will not run under 2h07'...in a ideal marathon he will run 2h07'if he run from the start 3'00''-3'01''/Km...your think?