I think Centro, even before Mo--and definitely before Galen.
A lot of guys have run fast times in their careers but few know what it's like to claim multiple medals in their event. Centro's done it pretty young, and has that natural talent for championship running that guys like Webb (with all his achievements) would probably trade for in a second. Mental and physical. Some guys have one in bounties, but it's rare to see both balanced mental and physical faculties in a runner. Sometimes Kiprop even surprises me with his changing mental state and apparent 'giving up' in DL races where he wasn't going to win. Aside from Galen's aberrant silver medal, he's more of a time-trialer. I just don't think he has the instincts of his teammates.
Ultimately, Centro always seems to put it together when it counts. Yes, he's dropped out and had sub-par performances, but he basically winged a 4th place at the Olympics after a potentially season-changing late injury. And his bronze in Daegu and silver in Moscow show that he's as good as anybody when he reaches the Finals healthy. I think Centro will end up with more medals than Farah for his career, and I think that'll piss off a lot of ppl here!