Makau seemed a nice guy and a Christian. I don't think he is the type that would be said to be drinking too much let alone drink. My guess is that he became complacent and lazy after he broke the world record in 2011. Since then, his performance has gradually gone down. A DNF in London 2012, a 2:06 in Frankfurt(same race where Kipsang ran 2:03:42) in fall of 2012, a 65 half marathon in March 2013 and the a 2:11 in London 2013. That is not a good sign for him. I think Kipsang will handle both (Makau as well as world record attempt).
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Kipsang ran his 2:03 in 2011, Makau won with 2:06 in 2012