Thomas Gerlach wrote:
But high-level athletes is a weird thing. The stress of the incident has likely already wreaked havoc. I might even suggest passing on the Ironman if I was FVL personally. If you are knocked unconscious 8 days prior to one of the hardest endurance events on the planet and pushes the body to the brink of the cliff, why take a chance.
I obviously have no real standing to give FVL advice, but I'd echo what Thomas says. Don't underestimate the effects of being concussed. He'll likely be fine, but negotiating a bike course at high speeds and going that far into the tank while nursing a healing brain seems like a bad call. I had a mid level concussion years ago and thought I was fine within a few weeks after. Funny thing though was that I kept misplacing keys, leaving my car lights on, forgetting to set my alarm, etc for month's afterward.