I mostly agree with the OP, injured rider with potential impairment of reaction speed and decision making gets the ‘all clear’ from his entirely unbiased team. He was reportedly unconscious for periods and had headaches over the evening.
Many sports won’t let you take part with a head injury until you demonstrate no impairment as concussed players/riders tend to cause accidents/have accidents and a second head injury to an already concussed individual can have wider consequences.
An independent Doctor clearing head injury cases wouldn’t be too hard to implement – its common in lots of sports.