“There is certainly a skill set involved in going 26 miles beyond running a fast 1500 meters, but a guy who combines sub-3:30 (1500m) ability with the half-marathon, like Mo, yeah, I think he can do it. Whether he can his first time out in London, I don’t know, but anyone who runs a fast 10K can run a fast marathon, I think.”
I certainly don't think so. It wasn't true for me back in the day. Let's come up with a list of fast 10k guys/gals that were failed marathoners.
1. Zersenay Tadese 26:37 10k and 2:10:41