First off, anyone who runs good mileage and has good form, does not necessarily "pound" mileage. He is too smooth for any pounding to be going on.
Also, he was indeed on antibiotics during the race and leading up to it, but he never mentioned it, others did. He is a man who makes no excuses.
It is possible that the mileage has little or nothing to do with his being sick twice. Perhaps he is marginally more open to bugs, like ALL elite athletes who train at a high level are - its a fine edge.
I also know that Natasha Fraser had a worse bug and trains less than half the volume Levins does....we also know everyone eventually gets colds and the flu and infections - sedentary people as well.
Nothing "happened" to Levins. First people are talking about him "coming out of nowhere", then suddenly, he is not performing. He moved up what? 30 spots in World Cross from his last performance, while being under the weather! That is solid.
The positives are that Chris Winter rocked the race as did Mo Ahmed. No one seems to mention Mo - the guy is a rock star. The team did well within themselves, in fact all four Canadian teams were solid!